A - 2
4. Special Function Registers (SFRs) 20
5. Programmable I/O Ports 24
5.1 Functions of Programmable I/O Ports.......................................................24
5.2 Effect on Peripheral Functions ..................................................................24
5.3 Pins Other than Programmable I/O Ports..................................................24
5.4 Port Settings..............................................................................................32
5.5 Unassigned Pin Handling..........................................................................37
6. Resets 38
6.1 Hardware Reset ........................................................................................40
6.1.1 When Power Supply is Stable ............................................................40
6.1.2 Power On............................................................................................40
6.2 Power-On Reset Function.........................................................................42
6.3 Voltage Monitor 1 Reset ...........................................................................43
6.4 Voltage Monitor 2 Reset............................................................................43
6.5 Watchdog Timer Reset..............................................................................43
6.6 Software Reset..........................................................................................43
7. Voltage Detection Circuit 44
7.1 VCC Input Voltage.....................................................................................50
7.1.1 Monitoring Vdet1 ................................................................................50
7.1.2 Monitoring Vdet2 ................................................................................50
7.1.3 Digital Filter.........................................................................................50
7.2 Voltage Monitor 1 Reset............................................................................52
7.3 Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset .........................53
8. Processor Mode 55
8.1 Processor Modes ......................................................................................55
9. Bus 57
10. Clock Generation Circuit 58
10.1 Main Clock.................................................................................................65
10.2 On-Chip Oscillator Clocks .........................................................................66
10.2.1 Low-Speed On-Chip Oscillator Clock.................................................66
10.2.2 High-Speed On-Chip Oscillator Clock ................................................66
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