SN8F2270B Datasheet, PDF (4/111 Pages) SONiX Technology Company – 8-Bit Micro-Controller

SN8F2270B Series
USB 2.0 Low-Speed 8-Bit Micro-Controller
3.6.2 Diode & RC Reset Circuit ............................................................................................................... 41
3.6.3 Zener Diode Reset Circuit ............................................................................................................... 41
3.6.4 Voltage Bias Reset Circuit............................................................................................................... 42
3.6.5 External Reset IC............................................................................................................................. 42
4 SYSTEM CLOCK .................................................................................................................................. 43
4.1 OVERVIEW ........................................................................................................................................... 43
4.2 CLOCK BLOCK DIAGRAM................................................................................................................. 43
4.3 OSCM REGISTER ................................................................................................................................. 44
4.4 SYSTEM HIGH CLOCK ....................................................................................................................... 45
4.4.1 INTERNAL HIGH RC...................................................................................................................... 45
4.5 SYSTEM LOW CLOCK ........................................................................................................................ 46
4.5.1 SYSTEM CLOCK MEASUREMENT ............................................................................................... 46
5 SYSTEM OPERATION MODE ........................................................................................................... 47
5.1 OVERVIEW ........................................................................................................................................... 47
5.2 SYSTEM MODE SWITCHING EXAMPLE ......................................................................................... 48
5.3 WAKEUP ............................................................................................................................................... 50
5.3.1 OVERVIEW ..................................................................................................................................... 50
5.3.2 WAKEUP TIME............................................................................................................................... 50
6 INTERRUPT........................................................................................................................................... 51
6.1 OVERVIEW ........................................................................................................................................... 51
6.2 INTEN INTERRUPT ENABLE REGISTER ......................................................................................... 52
6.3 INTRQ INTERRUPT REQUEST REGISTER....................................................................................... 53
6.4 GIE GLOBAL INTERRUPT OPERATION .......................................................................................... 54
6.5 PUSH, POP ROUTINE........................................................................................................................... 54
6.6 INT0 (P0.0) & INT1 (P0.1) INTERRUPT OPERATION....................................................................... 55
6.7 T0 INTERRUPT OPERATION.............................................................................................................. 57
6.8 TC0 INTERRUPT OPERATION ........................................................................................................... 58
6.9 USB INTERRUPT OPERATION .......................................................................................................... 59
6.10 WAKEUP INTERRUPT OPERATION ............................................................................................... 60
6.11 SIO INTERRUPT OPERATION.......................................................................................................... 61
6.12 MULTI-INTERRUPT OPERATION ................................................................................................... 62
7 I/O PORT ................................................................................................................................................ 63
7.1 I/O PORT MODE ................................................................................................................................... 63
7.2 I/O PULL UP REGISTER ...................................................................................................................... 64
7.3 I/O PORT DATA REGISTER ................................................................................................................ 65
7.4 I/O PORT1 WAKEUP CONTROL REGISTER..................................................................................... 66
8 TIMERS .................................................................................................................................................. 67
8.1 WATCHDOG TIMER............................................................................................................................ 67
8.2 TIMER 0 (T0) ......................................................................................................................................... 69
8.2.1 OVERVIEW ..................................................................................................................................... 69
8.2.2 T0M MODE REGISTER.................................................................................................................. 69
8.2.3 T0C COUNTING REGISTER.......................................................................................................... 70
8.2.4 T0 TIMER OPERATION SEQUENCE ............................................................................................ 71
8.3 TIMER/COUNTER 0 (TC0)................................................................................................................... 72
8.3.1 OVERVIEW ..................................................................................................................................... 72
8.3.2 TC0M MODE REGISTER ............................................................................................................... 73
8.3.3 TC0C COUNTING REGISTER ....................................................................................................... 74
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