SONiX TECHNOLOGY CO. SN8F22711B, User Manual

Page: 4 / 120

SN8F2270B Series
USB 2.0 Low-Speed 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 4
Version 1.3
3.1 OVERVIEW ........................................................................................................................................... 38
3.2 POWER ON RESET............................................................................................................................... 40
3.3 WATCHDOG RESET ............................................................................................................................ 40
3.4 BROWN OUT RESET ........................................................................................................................... 41
3.4.1 BROWN OUT DESCRIPTION ........................................................................................................ 41
3.4.2 THE SYSTEM OPERATING VOLTAGE DECSRIPTION............................................................... 42
3.4.3 BROWN OUT RESET IMPROVEMENT......................................................................................... 43
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............................................................................................................................. 46
4 SYSTEM CLOCK .................................................................................................................................. 47
4.1 OVERVIEW ........................................................................................................................................... 47
4.2 CLOCK BLOCK DIAGRAM................................................................................................................. 47
4.3 OSCM REGISTER ................................................................................................................................. 48
4.4 SYSTEM HIGH CLOCK ....................................................................................................................... 49
4.4.1 INTERNAL HIGH RC...................................................................................................................... 49
4.5 SYSTEM LOW CLOCK ........................................................................................................................ 49
4.5.1 SYSTEM CLOCK MEASUREMENT ............................................................................................... 50
5 SYSTEM OPERATION MODE ........................................................................................................... 51
5.1 OVERVIEW ........................................................................................................................................... 51
5.2 SYSTEM MODE SWITCHING EXAMPLE ......................................................................................... 52
5.3 WAKEUP ............................................................................................................................................... 54
5.3.1 OVERVIEW ..................................................................................................................................... 54
5.3.2 WAKEUP TIME............................................................................................................................... 54
6 INTERRUPT........................................................................................................................................... 55
6.1 OVERVIEW ........................................................................................................................................... 55
6.2 INTEN INTERRUPT ENABLE REGISTER ......................................................................................... 56
6.3 INTRQ INTERRUPT REQUEST REGISTER....................................................................................... 56
6.4 GIE GLOBAL INTERRUPT OPERATION .......................................................................................... 57
6.5 PUSH, POP ROUTINE........................................................................................................................... 57
6.6 INT0 (P0.0) & INT1 (P0.1) INTERRUPT OPERATION....................................................................... 59
6.7 T0 INTERRUPT OPERATION.............................................................................................................. 61
6.8 TC0 INTERRUPT OPERATION ........................................................................................................... 62
6.9 USB INTERRUPT OPERATION .......................................................................................................... 63