SMBP2501BPB datasheet(5/107 Pages) SONIX

5 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 5

Version 2.1

3.6.3

Zener Diode Reset Circuit ........................................................................................................ 43

3.6.4

Voltage Bias Reset Circuit ....................................................................................................... 44

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

INTERNAL HIGH RC ............................................................................................................. 48

4.4.2

EXTERNAL HIGH CLOCK.................................................................................................... 49

4.4.2.1

CRYSTAL/CERAMIC......................................................................................................... 50

4.4.2.2

RC......................................................................................................................................... 50

4.4.2.3

EXTERNAL CLOCK SIGNAL........................................................................................... 51

4.5

SYSTEM LOW CLOCK .................................................................................................................. 52

4.5.1

SYSTEM CLOCK MEASUREMENT .................................................................................... 53

SYSTEM OPERATION MODE ........................................................................................................... 54

5.1

OVERVIEW ..................................................................................................................................... 54

5.2

NORMAL MODE ............................................................................................................................ 55

5.3

SLOW MODE .................................................................................................................................. 55

5.4

POWER DOWN MDOE .................................................................................................................. 55

5.5

GREEN MODE ................................................................................................................................ 56

5.6

SYSTEM MODE SWITCHING EXAMPLE ................................................................................... 56

5.7

WAKEUP ......................................................................................................................................... 58

5.7.1

OVERVIEW ............................................................................................................................. 58

5.7.2

WAKEUP TIME ...................................................................................................................... 58

5.7.3

P1W WAKEUP CONTROL REGISTER ................................................................................ 59

INTERRUPT........................................................................................................................................... 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

6.6

INT0 (P0.0) INTERRUPT OPERATION......................................................................................... 65

6.7

T0 INTERRUPT OPERATION........................................................................................................ 66

6.8

TC0 INTERRUPT OPERATION ..................................................................................................... 68

6.9

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 OPEN-DRAIN REGISTER........................................................................................................ 72

7.4

I/O PORT DATA 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 ......................................................................................................... 77

8.2.3

T0C COUNTING REGISTER ................................................................................................. 78

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