Atmel ATmega48PV Manual de usuario

Features

•High Performance, Low Power AVR® 8-Bit Microcontroller

•Advanced RISC Architecture

– 131 Powerful Instructions – Most Single Clock Cycle Execution

– 32 x 8 General Purpose Working Registers

– Fully Static Operation

– Up to 20 MIPS Throughput at 20 MHz

– On-chip 2-cycle Multiplier

•High Endurance Non-volatile Memory Segments

– 4/8/16/32K Bytes of In-System Self-Programmable Flash progam memory

(ATmega48P/88P/168P/328P)

– 256/512/512/1K Bytes EEPROM (ATmega48P/88P/168P/328P)

– 512/1K/1K/2K Bytes Internal SRAM (ATmega48P/88P/168P/328P)

– Write/Erase Cycles: 10,000 Flash/100,000 EEPROM

– Data retention: 20 years at 85°C/100 years at 25°C(1)

– Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program

True Read-While-Write Operation

– Programming Lock for Software Security

•Peripheral Features

– Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode

– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture

Mode

– Real Time Counter with Separate Oscillator

– Six PWM Channels

– 8-channel 10-bit ADC in TQFP and QFN/MLF package

Temperature Measurement

– 6-channel 10-bit ADC in PDIP Package

Temperature Measurement

– Programmable Serial USART

– Master/Slave SPI Serial Interface

– Byte-oriented 2-wire Serial Interface (Philips I2C compatible)

– Programmable Watchdog Timer with Separate On-chip Oscillator

– On-chip Analog Comparator

– Interrupt and Wake-up on Pin Change

•Special Microcontroller Features

– Power-on Reset and Programmable Brown-out Detection

– Internal Calibrated Oscillator

– External and Internal Interrupt Sources

– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby,

and Extended Standby

•I/O and Packages

– 23 Programmable I/O Lines

– 28-pin PDIP, 32-lead TQFP, 28-pad QFN/MLF and 32-pad QFN/MLF

•Operating Voltage:

– 1.8 - 5.5V for ATmega48P/88P/168PV

– 2.7 - 5.5V for ATmega48P/88P/168P

– 1.8 - 5.5V for ATmega328P

•Temperature Range:

–-40

°C to 85°C

•Speed Grade:

– ATmega48P/88P/168PV: 0 - 4 MHz @ 1.8 - 5.5V, 0 - 10 MHz @ 2.7 - 5.5V

– ATmega48P/88P/168P: 0 - 10 MHz @ 2.7 - 5.5V, 0 - 20 MHz @ 4.5 - 5.5V

– ATmega328P: 0 - 4 MHz @ 1.8 - 5.5V, 0 - 10 MHz @ 2.7 - 5.5V, 0 - 20 MHz @ 4.5 - 5.5V

•Low Power Consumption at 1 MHz, 1.8V, 25°C for ATmega48P/88P/168P:

– Active Mode: 0.3 mA

– Power-down Mode: 0.1 µA

– Power-save Mode: 0.8 µA (Including 32 kHz RTC)

Note: 1. See ”Data Retention” on page 7 for details.

8-bit

Microcontroller

with 4/8/16/32K

Bytes In-System

Programmable

Flash

ATmega48P/V*

ATmega88P/V*

ATmega168P/V

ATmega328P**

**Preliminary

*Not recommended for new designs.

Rev. 8025I–AVR–02/09

8025I–AVR–02/09

ATmega48P/88P/168P/328P

1. Pin Configurations

Figure 1-1. Pinout ATmega48P/88P/168P/328P

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

GND

VCC

GND

VCC

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

ADC7

GND

AREF

ADC6

AVCC

PB5 (SCK/PCINT5)

(PCINT21/OC0B/T1) PD5

(PCINT22/OC0A/AIN0) PD6

(PCINT23/AIN1) PD7

(PCINT0/CLKO/ICP1) PB0

(PCINT1/OC1A) PB1

(PCINT2/SS/OC1B) PB2

(PCINT3/OC2A/MOSI) PB3

(PCINT4/MISO) PB4

PD2 (INT0/PCINT18)

PD1 (TXD/PCINT17)

PD0 (RXD/PCINT16)

PC6 (RESET/PCINT14)

PC5 (ADC5/SCL/PCINT13)

PC4 (ADC4/SDA/PCINT12)

PC3 (ADC3/PCINT11)

PC2 (ADC2/PCINT10)

TQFPTop View

(PCINT14/RESET) PC6

(PCINT16/RXD) PD0

(PCINT17/TXD) PD1

(PCINT18/INT0) PD2

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

VCC

GND

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

(PCINT21/OC0B/T1) PD5

(PCINT22/OC0A/AIN0) PD6

(PCINT23/AIN1) PD7

(PCINT0/CLKO/ICP1) PB0

PC5 (ADC5/SCL/PCINT13)

PC4 (ADC4/SDA/PCINT12)

PC3 (ADC3/PCINT11)

PC2 (ADC2/PCINT10)

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

GND

AREF

AVCC

PB5 (SCK/PCINT5)

PB4 (MISO/PCINT4)

PB3 (MOSI/OC2A/PCINT3)

PB2 (SS/OC1B/PCINT2)

PB1 (OC1A/PCINT1)

PDIP

32 MLFTop View

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

GND

VCC

GND

VCC

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

ADC7

GND

AREF

ADC6

AVCC

PB5 (SCK/PCINT5)

(PCINT21/OC0B/T1) PD5

(PCINT22/OC0A/AIN0) PD6

(PCINT23/AIN1) PD7

(PCINT0/CLKO/ICP1) PB0

(PCINT1/OC1A) PB1

(PCINT2/SS/OC1B) PB2

(PCINT3/OC2A/MOSI) PB3

(PCINT4/MISO) PB4

PD2 (INT0/PCINT18)

PD1 (TXD/PCINT17)

PD0 (RXD/PCINT16)

PC6 (RESET/PCINT14)

PC5 (ADC5/SCL/PCINT13)

PC4 (ADC4/SDA/PCINT12)

PC3 (ADC3/PCINT11)

PC2 (ADC2/PCINT10)

NOTE: Bottom pad should be soldered to ground.

28 MLFTop View

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

VCC

GND

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

(PCINT21/OC0B/T1) PD5

(PCINT22/OC0A/AIN0) PD6

(PCINT23/AIN1) PD7

(PCINT0/CLKO/ICP1) PB0

(PCINT1/OC1A) PB1

(PCINT2/SS/OC1B) PB2

(PCINT3/OC2A/MOSI) PB3

(PCINT4/MISO) PB4

PD2 (INT0/PCINT18)

PD1 (TXD/PCINT17)

PD0 (RXD/PCINT16)

PC6 (RESET/PCINT14)

PC5 (ADC5/SCL/PCINT13)

PC4 (ADC4/SDA/PCINT12)

PC3 (ADC3/PCINT11)

PC2 (ADC2/PCINT10)

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

GND

AREF

AVCC

PB5 (SCK/PCINT5)

NOTE: Bottom pad should be soldered to ground.

8025I–AVR–02/09

ATmega48P/88P/168P/328P

1.1 Pin Descriptions

1.1.1 VCC Digital supply voltage.

1.1.2 GND Ground.

1.1.3 Port B (PB7:0) XTAL1/XTAL2/TOSC1/TOSC2

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port B output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Depending on the clock selection fuse settings, PB6 can be used as input to the inverting Oscil-

lator amplifier and input to the internal clock operating circuit.

Depending on the clock selection fuse settings, PB7 can be used as output from the inverting

Oscillator amplifier.

If the Internal Calibrated RC Oscillator is used as chip clock source, PB7..6 is used as TOSC2..1

input for the Asynchronous Timer/Counter2 if the AS2 bit in ASSR is set.

The various special features of Port B are elaborated in ”Alternate Functions of Port B” on page

82 and ”System Clock and Clock Options” on page 26.

1.1.4 Port C (PC5:0) Port C is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

PC5..0 output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port C pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

1.1.5 PC6/RESET If the RSTDISBL Fuse is programmed, PC6 is used as an I/O pin. Note that the electrical char-

acteristics of PC6 differ from those of the other pins of Port C.

If the RSTDISBL Fuse is unprogrammed, PC6 is used as a Reset input. A low level on this pin

for longer than the minimum pulse length will generate a Reset, even if the clock is not running.

The minimum pulse length is given in Table 26-3 on page 320. Shorter pulses are not guaran-

teed to generate a Reset.

The various special features of Port C are elaborated in ”Alternate Functions of Port C” on page

85.

1.1.6 Port D (PD7:0) Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port D output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port D pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

8025I–AVR–02/09

ATmega48P/88P/168P/328P

The various special features of Port D are elaborated in ”Alternate Functions of Port D” on page

88.

1.1.7 AVCC AVCC is the supply voltage pin for the A/D Converter, PC3:0, and ADC7:6. It should be externally

connected to VCC, even if the ADC is not used. If the ADC is used, it should be connected to VCC

through a low-pass filter. Note that PC6..4 use digital supply voltage, VCC.

1.1.8 AREF AREF is the analog reference pin for the A/D Converter.

1.1.9 ADC7:6 (TQFP and QFN/MLF Package Only)

In the TQFP and QFN/MLF package, ADC7:6 serve as analog inputs to the A/D converter.

These pins are powered from the analog supply and serve as 10-bit ADC channels.

2. Overview The ATmega48P/88P/168P/328P is a low-power CMOS 8-bit microcontroller based on the AVR

enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the

ATmega48P/88P/168P/328P achieves throughputs approaching 1 MIPS per MHz allowing the

system designer to optimize power consumption versus processing speed.

8025I–AVR–02/09

ATmega48P/88P/168P/328P

2.1 Block Diagram

Figure 2-1. Block Diagram

The AVR core combines a rich instruction set with 32 general purpose working registers. All the

32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

registers to be accessed in one single instruction executed in one clock cycle. The resulting

architecture is more code efficient while achieving throughputs up to ten times faster than con-

ventional CISC microcontrollers.

The ATmega48P/88P/168P/328P provides the following features: 4K/8K/16K/32K bytes of In-

System Programmable Flash with Read-While-Write capabilities, 256/512/512/1K bytes

EEPROM, 512/1K/1K/2K bytes SRAM, 23 general purpose I/O lines, 32 general purpose work-

ing registers, three flexible Timer/Counters with compare modes, internal and external

interrupts, a serial programmable USART, a byte-oriented 2-wire Serial Interface, an SPI serial

port, a 6-channel 10-bit ADC (8 channels in TQFP and QFN/MLF packages), a programmable

PORT C (7)PORT B (8)PORT D (8)

USART 0

8bit T/C 2

16bit T/C 18bit T/C 0 A/D Conv.

Internal

Bandgap

Analog

Comp.

SPI TWI

SRAMFlash

EEPROM

Watchdog

Oscillator

Watchdog

Timer

Oscillator

Circuits /

Clock

Generation

Power

Supervision

POR / BOD &

RESET

VCC

GND

PROGRAM

LOGIC

debugWIRE

GND

AREF

AVCC

D ATA BU S

ADC[6..7]PC[0..6]PB[0..7]PD[0..7]

RESET

XTAL[1..2]

CPU

8025I–AVR–02/09

ATmega48P/88P/168P/328P

Watchdog Timer with internal Oscillator, and five software selectable power saving modes. The

Idle mode stops the CPU while allowing the SRAM, Timer/Counters, USART, 2-wire Serial Inter-

face, SPI port, and interrupt system to continue functioning. The Power-down mode saves the

rupt or hardware reset. In Power-save mode, the asynchronous timer continues to run, allowing

the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduc-

tion mode stops the CPU and all I/O modules except asynchronous timer and ADC, to minimize

switching noise during ADC conversions. In Standby mode, the crystal/resonator Oscillator is

running while the rest of the device is sleeping. This allows very fast start-up combined with low

power consumption.

The device is manufactured using Atmel’s high density non-volatile memory technology. The

On-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI

serial interface, by a conventional non-volatile memory programmer, or by an On-chip Boot pro-

gram running on the AVR core. The Boot program can use any interface to download the

application program in the Application Flash memory. Software in the Boot Flash section will

continue to run while the Application Flash section is updated, providing true Read-While-Write

operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a

monolithic chip, the Atmel ATmega48P/88P/168P/328P is a powerful microcontroller that pro-

vides a highly flexible and cost effective solution to many embedded control applications.

The ATmega48P/88P/168P/328P AVR is supported with a full suite of program and system

development tools including: C Compilers, Macro Assemblers, Program Debugger/Simulators,

In-Circuit Emulators, and Evaluation kits.

2.2 Comparison Between ATmega48P, ATmega88P, ATmega168P, and ATmega328P

The ATmega48P, ATmega88P, ATmega168P, and ATmega328P differ only in memory sizes,

boot loader support, and interrupt vector sizes. Table 2-1 summarizes the different memory and

interrupt vector sizes for the three devices.

ATmega88P, ATmega168P, and ATmega328P support a real Read-While-Write Self-Program-

ming mechanism. There is a separate Boot Loader Section, and the SPM instruction can only

execute from there. In ATmega48P, there is no Read-While-Write support and no separate Boot

Loader Section. The SPM instruction can execute from the entire Flash.

Table 2-1. Memory Size Summary

Device Flash EEPROM RAM Interrupt Vector Size

ATmega48P 4K Bytes 256 Bytes 512 Bytes 1 instruction word/vector

ATmega88P 8K Bytes 512 Bytes 1K Bytes 1 instruction word/vector

ATmega168P 16K Bytes 512 Bytes 1K Bytes 2 instruction words/vector

ATmega328P 32K Bytes 1K Bytes 2K Bytes 2 instructions words/vector

8025I–AVR–02/09

ATmega48P/88P/168P/328P

3. About

3.1 Disclaimer Typical values contained in this datasheet are based on simulations and characterization of

other AVR microcontrollers manufactured on the same process technology. Min and Max values

will be available after the device is characterized.

3.2 Resources A comprehensive set of development tools, application notes and datasheets are available for

download on http://www.atmel.com/avr.

Note: 1.

3.3 Data Retention

Reliability Qualification results show that the projected data retention failure rate is much less

than 1 PPM over 20 years at 85°C or 100 years at 25°C.

3.4 Code Examples

This documentation contains simple code examples that briefly show how to use various parts of

the device. These code examples assume that the part specific header file is included before

compilation. Be aware that not all C compiler vendors include bit definitions in the header files

and interrupt handling in C is compiler dependent. Please confirm with the C compiler documen-

tation for more details.

For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI”

instructions must be replaced with instructions that allow access to extended I/O. Typically

“LDS” and “STS” combined with “SBRS”, “SBRC”, “SBR”, and “CBR”.

8025I–AVR–02/09

ATmega48P/88P/168P/328P

4. AVR CPU Core

4.1 Overview This section discusses the AVR core architecture in general. The main function of the CPU core

is to ensure correct program execution. The CPU must therefore be able to access memories,

perform calculations, control peripherals, and handle interrupts.

Figure 4-1. Block Diagram of the AVR Architecture

In order to maximize performance and parallelism, the AVR uses a Harvard architecture – with

separate memories and buses for program and data. Instructions in the program memory are

executed with a single level pipelining. While one instruction is being executed, the next instruc-

tion is pre-fetched from the program memory. This concept enables instructions to be executed

in every clock cycle. The program memory is In-System Reprogrammable Flash memory.

The fast-access Register File contains 32 x 8-bit general purpose working registers with a single

clock cycle access time. This allows single-cycle Arithmetic Logic Unit (ALU) operation. In a typ-

Flash

Program

Memory

Instruction

Decoder

Program

Counter

Control Lines

32 x 8

General

Purpose

Registrers

ALU

Status

and Control

I/O Lines

EEPROM

Data Bus 8-bit

Data

SRAM

Direct Addressing

Indirect Addressing

Interrupt

Unit

SPI

Unit

Watchdog

Timer

Analog

Comparator

I/O Module 2

I/O Module1

I/O Module n

8025I–AVR–02/09

ATmega48P/88P/168P/328P

ical ALU operation, two operands are output from the Register File, the operation is executed,

and the result is stored back in the Register File – in one clock cycle.

Six of the 32 registers can be used as three 16-bit indirect address register pointers for Data

Space addressing – enabling efficient address calculations. One of the these address pointers

can also be used as an address pointer for look up tables in Flash program memory. These

added function registers are the 16-bit X-, Y-, and Z-register, described later in this section.

The ALU supports arithmetic and logic operations between registers or between a constant and

a register. Single register operations can also be executed in the ALU. After an arithmetic opera-

tion, the Status Register is updated to reflect information about the result of the operation.

Program flow is provided by conditional and unconditional jump and call instructions, able to

directly address the whole address space. Most AVR instructions have a single 16-bit word for-

mat. Every program memory address contains a 16- or 32-bit instruction.

Program Flash memory space is divided in two sections, the Boot Program section and the

Application Program section. Both sections have dedicated Lock bits for write and read/write

protection. The SPM instruction that writes into the Application Flash memory section must

reside in the Boot Program section.

During interrupts and subroutine calls, the return address Program Counter (PC) is stored on the

Stack. The Stack is effectively allocated in the general data SRAM, and consequently the Stack

size is only limited by the total SRAM size and the usage of the SRAM. All user programs must

initialize the SP in the Reset routine (before subroutines or interrupts are executed). The Stack

Pointer (SP) is read/write accessible in the I/O space. The data SRAM can easily be accessed

through the five different addressing modes supported in the AVR architecture.

The memory spaces in the AVR architecture are all linear and regular memory maps.

A flexible interrupt module has its control registers in the I/O space with an additional Global

Interrupt Enable bit in the Status Register. All interrupts have a separate Interrupt Vector in the

Interrupt Vector table. The interrupts have priority in accordance with their Interrupt Vector posi-

tion. The lower the Interrupt Vector address, the higher the priority.

The I/O memory space contains 64 addresses for CPU peripheral functions as Control Regis-

ters, SPI, and other I/O functions. The I/O Memory can be accessed directly, or as the Data

Space locations following those of the Register File, 0x20 - 0x5F. In addition, the

ATmega48P/88P/168P/328P has Extended I/O space from 0x60 - 0xFF in SRAM where only

the ST/STS/STD and LD/LDS/LDD instructions can be used.

4.2 ALU – Arithmetic Logic Unit

The high-performance AVR ALU operates in direct connection with all the 32 general purpose

working registers. Within a single clock cycle, arithmetic operations between general purpose

registers or between a register and an immediate are executed. The ALU operations are divided

into three main categories – arithmetic, logical, and bit-functions. Some implementations of the

architecture also provide a powerful multiplier supporting both signed/unsigned multiplication

and fractional format. See the “Instruction Set” section for a detailed description.

4.3 Status Register

The Status Register contains information about the result of the most recently executed arithme-

tic instruction. This information can be used for altering program flow in order to perform

conditional operations. Note that the Status Register is updated after all ALU operations, as

8025I–AVR–02/09

ATmega48P/88P/168P/328P

specified in the Instruction Set Reference. This will in many cases remove the need for using the

dedicated compare instructions, resulting in faster and more compact code.

The Status Register is not automatically stored when entering an interrupt routine and restored

when returning from an interrupt. This must be handled by software.

4.3.1 SREG – AVR Status Register

The AVR Status Register – SREG – is defined as:

• Bit 7 – I: Global Interrupt Enable

The Global Interrupt Enable bit must be set for the interrupts to be enabled. The individual inter-

rupt enable control is then performed in separate control registers. If the Global Interrupt Enable

enable settings. The I-bit is cleared by hardware after an interrupt has occurred, and is set by

the RETI instruction to enable subsequent interrupts. The I-bit can also be set and cleared by

the application with the SEI and CLI instructions, as described in the instruction set reference.

• Bit 6 – T: Bit Copy Storage

The Bit Copy instructions BLD (Bit LoaD) and BST (Bit STore) use the T-bit as source or desti-

nation for the operated bit. A bit from a register in the Register File can be copied into T by the

BST instruction, and a bit in T can be copied into a bit in a register in the Register File by the

BLD instruction.

• Bit 5 – H: Half Carry Flag

The Half Carry Flag H indicates a Half Carry in some arithmetic operations. Half Carry Is useful

in BCD arithmetic. See the “Instruction Set Description” for detailed information.

• Bit 4 – S: Sign Bit, S = N ⊕ V

The S-bit is always an exclusive or between the Negative Flag N and the Two’s Complement

Overflow Flag V. See the “Instruction Set Description” for detailed information.

• Bit 3 – V: Two’s Complement Overflow Flag

The Two’s Complement Overflow Flag V supports two’s complement arithmetics. See the

“Instruction Set Description” for detailed information.

• Bit 2 – N: Negative Flag

The Negative Flag N indicates a negative result in an arithmetic or logic operation. See the

“Instruction Set Description” for detailed information.

• Bit 1 – Z: Zero Flag

The Zero Flag Z indicates a zero result in an arithmetic or logic operation. See the “Instruction

Set Description” for detailed information.

• Bit 0 – C: Carry Flag

The Carry Flag C indicates a carry in an arithmetic or logic operation. See the “Instruction Set

Description” for detailed information.

Bit 76543210

0x3F (0x5F) I T H S V N Z C SREG

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

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