SN8P2501C
8-Bit Micro-Controller
2.5.3
2.5.4
Security code option..............................................................................................................29
Low_Power code option........................................................................................................29
33 RESET ................................................................................................................................................30
3.1 OVERVIEW ................................................................................................................................30
3.2 POWER ON RESET.....................................................................................................................31
3.3 WATCHDOG RESET ..................................................................................................................31
3.4 BROWN OUT RESET..................................................................................................................31
3.5 THE SYSTEM OPERATING VOLTAGE ....................................................................................32
3.6 LOW VOLTAGE DETECTOR (LVD) .........................................................................................32
3.7 BROWN OUT RESET IMPROVEMENT.....................................................................................34
3.8 EXTERNAL RESET ....................................................................................................................35
3.9 EXTERNAL RESET CIRCUIT ....................................................................................................35
3.9.1 Simply RC Reset Circuit........................................................................................................35
3.9.2 Diode & RC Reset Circuit .....................................................................................................36
3.9.3 Zener Diode Reset Circuit.....................................................................................................36
3.9.4 Voltage Bias Reset Circuit ....................................................................................................37
3.9.5 External Reset IC..................................................................................................................37
44 SYSTEM CLOCK..............................................................................................................................38
4.1 OVERVIEW ................................................................................................................................38
4.2 FCPU (INSTRUCTION CYCLE)...................................................................................................38
4.3 SYSTEM HIGH-SPEED CLOCK.................................................................................................38
4.4 SYSTEM LOW-SPEED CLOCK .................................................................................................39
4.5 OSCM REGISTER.......................................................................................................................39
4.6 SYSTEM CLOCK MEASUREMENT ..........................................................................................40
4.7 SYSTEM CLOCK TIMING .........................................................................................................41
55 SYSTEM OPERATION MODE........................................................................................................43
5.1 OVERVIEW ................................................................................................................................43
5.2 NORMAL MODE ........................................................................................................................44
5.3 SLOW MODE ..............................................................................................................................44
5.4 POWER DOWN MDOE...............................................................................................................44
5.5 GREEN MODE ............................................................................................................................45
5.6 OPERATING MODE CONTROL MACRO .................................................................................46
5.7 WAKEUP.....................................................................................................................................47
5.7.1 OVERVIEW ..........................................................................................................................47
5.7.2 WAKEUP TIME....................................................................................................................47
5.7.3 P1W WAKEUP CONTROL REGISTER.................................................................................48
66 INTERRUPT ......................................................................................................................................49
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Preliminary Version 0.3