SN8F2250B datasheet(4/133 Pages) SONIX

4 / 133 page

SN8F2250B Series

USB 2.0 Full-Speed 8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 4

Version 1.1

3.6.2 Diode & RC Reset Circuit ............................................................................................... 44

3.6.3 Zener Diode Reset Circuit .............................................................................................. 44

3.6.4 Voltage Bias Reset Circuit.............................................................................................. 45

3.6.5 External Reset IC ........................................................................................................... 45

SYSTEM CLOCK.................................................................................................................... 46

4.1 OVERVIEW........................................................................................................................... 46

4.2 CLOCK BLOCK DIAGRAM ................................................................................................... 46

4.3 OSCM REGISTER ................................................................................................................ 47

4.4 SYSTEM HIGH CLOCK......................................................................................................... 48

4.4.1 EXTERNAL HIGH CLOCK ............................................................................................. 48

4.4.1.1 CRYSTAL/CERAMIC............................................................................................... 49

4.1.1.2 EXTERNAL CLOCK SIGNAL................................................................................... 50

4.2 SYSTEM LOW CLOCK ......................................................................................................... 51

4.2.1 SYSTEM CLOCK MEASUREMENT............................................................................... 51

SYSTEM OPERATION MODE................................................................................................ 52

5.1 OVERVIEW........................................................................................................................... 52

5.2 SYSTEM MODE SWITCHING EXAMPLE ............................................................................. 53

5.3 WAKEUP............................................................................................................................... 55

5.3.1 OVERVIEW .................................................................................................................... 55

5.3.2 WAKEUP TIME .............................................................................................................. 55

INTERRUPT............................................................................................................................ 56

6.1 OVERVIEW........................................................................................................................... 56

6.2 INTEN INTERRUPT ENABLE REGISTER ............................................................................ 57

6.3 INTRQ INTERRUPT REQUEST REGISTER......................................................................... 58

6.4 GIE GLOBAL INTERRUPT OPERATION.............................................................................. 59

6.5 PUSH, POP ROUTINE .......................................................................................................... 59

6.6 INT0 (P0.0) & INT1 (P0.1) INTERRUPT OPERATION........................................................... 60

6.7 T0 INTERRUPT OPERATION............................................................................................... 62

6.8 T1 INTERRUPT OPERATION............................................................................................... 63

6.9 TC0 INTERRUPT OPERATION ............................................................................................ 64

6.10 TC1 INTERRUPT OPERATION .......................................................................................... 65

6.11 USB INTERRUPT OPERATION.......................................................................................... 66

6.12 WAKEUP INTERRUPT OPERATION.................................................................................. 67

6.13 SIO INTERRUPT OPERATION........................................................................................... 68

6.14 MULTI-INTERRUPT OPERATION...................................................................................... 69

I/O PORT................................................................................................................................. 70

7.1 I/O PORT MODE ................................................................................................................... 70

7.2 I/O PULL UP REGISTER....................................................................................................... 71

7.3 I/O PORT DATA REGISTER ................................................................................................. 72

7.4 I/O PORT1 WAKEUP CONTROL REGISTER ....................................................................... 73

TIMERS................................................................................................................................... 74

8.1 WATCHDOG TIMER ............................................................................................................. 74

8.2 TIMER 0 (T0)......................................................................................................................... 76

8.2.1 OVERVIEW .................................................................................................................... 76

8.2.2 T0M MODE REGISTER ................................................................................................. 76

8.2.3 T0C COUNTING REGISTER ......................................................................................... 77

8.2.4 T0 TIMER OPERATION SEQUENCE ............................................................................ 78

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