SN8P2711A
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 4 Version0.1
3.1 OVERVIEW..................................................................................................................................... 38
3.2 POWER ON RESET......................................................................................................................... 39
3.3 WATCHDOG RESET...................................................................................................................... 39
3.4 BROWN OUT RESET ..................................................................................................................... 40
3.4.1 BROWN OUT DESCRIPTION............................................................................................... 40
3.4.2 THE SYSTEM OPERATING VOLTAGE DECSRIPTION................................................... 41
3.4.3 BROWN OUT RESET IMPROVEMENT .............................................................................. 41
3.5 EXTERNAL RESET........................................................................................................................ 44
3.6 EXTERNAL RESET CIRCUIT ....................................................................................................... 44
3.6.1 Simply RC Reset Circuit .......................................................................................................... 44
3.6.2 Diode & RC Reset Circuit........................................................................................................ 45
3.6.3 Zener Diode Reset Circuit........................................................................................................ 45
3.6.4 Voltage Bias Reset Circuit ....................................................................................................... 46
3.6.5 External Reset IC...................................................................................................................... 47
4
4
4SYSTEM CLOCK.......................................................................................................................... 48
4.1 OVERVIEW..................................................................................................................................... 48
4.2 CLOCK BLOCK DIAGRAM .......................................................................................................... 48
4.3 OSCM REGISTER........................................................................................................................... 49
4.4 SYSTEM HIGH CLOCK ................................................................................................................. 50
4.4.1 INTERNAL HIGH RC............................................................................................................. 50
4.4.2 EXTERNAL HIGH CLOCK.................................................................................................... 50
4.4.2.1 CRYSTAL/CERAMIC......................................................................................................... 51
4.4.2.2 RC......................................................................................................................................... 51
4.4.2.3 EXTERNAL CLOCK SIGNAL........................................................................................... 52
4.5 SYSTEM LOW CLOCK.................................................................................................................. 53
4.5.1 SYSTEM CLOCK MEASUREMENT .................................................................................... 54
5
5
5SYSTEM OPERATION MODE................................................................................................... 56
5.1 OVERVIEW..................................................................................................................................... 56
5.2 SYSTEM MODE SWITCHING EXAMPLE................................................................................... 57
5.3 WAKEUP......................................................................................................................................... 59
5.3.1 OVERVIEW............................................................................................................................. 59
5.3.2 WAKEUP TIME ...................................................................................................................... 59
6
6
6INTERRUPT................................................................................................................................... 60
6.1 OVERVIEW..................................................................................................................................... 60
6.2 INTEN INTERRUPT ENABLE REGISTER................................................................................... 61
6.3 INTRQ INTERRUPT REQUEST REGISTER ................................................................................ 62
6.4 GIE GLOBAL INTERRUPT OPERATION .................................................................................... 63
6.5 PUSH, POP ROUTINE .................................................................................................................... 64
