A - 2

6.

Voltage Detection Circuit .............................................................................................................. 40

6.1

VCC Input Voltage .................................................................................................................................. 47

6.1.1

Monitoring Vdet0 ............................................................................................................................... 47

6.1.2

Monitoring Vdet1 ............................................................................................................................... 47

6.1.3

Monitoring Vdet2 ............................................................................................................................... 47

6.2

Voltage Monitor 0 Reset ......................................................................................................................... 48

6.3

Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset ..................................................................... 49

6.4

Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset ..................................................................... 51

7.

Programmable I/O Ports ............................................................................................................... 53

7.1

Functions of Programmable I/O Ports ..................................................................................................... 53

7.2

Effect on Peripheral Functions ................................................................................................................ 54

7.3

Pins Other than Programmable I/O Ports ................................................................................................ 54

7.4

Port settings ............................................................................................................................................. 71

7.5

Unassigned Pin Handling ........................................................................................................................ 92

8.

Processor Mode ............................................................................................................................ 93

8.1

Processor Modes ...................................................................................................................................... 93

9.

Bus ................................................................................................................................................ 94

10.

Clock Generation Circuit ............................................................................................................... 96

10.1

XIN Clock ............................................................................................................................................. 106

10.2

On-Chip Oscillator Clocks .................................................................................................................... 107

10.2.1

Low-Speed On-Chip Oscillator Clock .............................................................................................. 107

10.2.2

High-Speed On-Chip Oscillator Clock ............................................................................................. 107

10.3

XCIN Clock ........................................................................................................................................... 108

10.4

CPU Clock and Peripheral Function Clock ........................................................................................... 109

10.4.1

System Clock .................................................................................................................................... 109

10.4.2

CPU Clock ........................................................................................................................................ 109

10.4.3

Peripheral Function Clock (f1, f2, f4, f8, and f32) ........................................................................... 109

10.4.4

fOCO ................................................................................................................................................. 109

10.4.5

fOCO40M ......................................................................................................................................... 109

10.4.6

fOCO-F ............................................................................................................................................. 109

10.4.7

fOCO-S ............................................................................................................................................. 109

10.4.8

fOCO128 ........................................................................................................................................... 109

10.4.9

fC4 and fC32 ..................................................................................................................................... 110

10.5

Power Control ........................................................................................................................................ 111

10.5.1

Standard Operating Mode ................................................................................................................. 111

10.5.2

Wait Mode ........................................................................................................................................ 113

10.5.3

Stop Mode ......................................................................................................................................... 117

10.6

Oscillation Stop Detection Function ..................................................................................................... 120

10.6.1

How to Use Oscillation Stop Detection Function ............................................................................. 120

10.7

Notes on Clock Generation Circuit ....................................................................................................... 123

10.7.1

Stop Mode ......................................................................................................................................... 123

10.7.2

Wait Mode ........................................................................................................................................ 123

10.7.3

Oscillation Stop Detection Function ................................................................................................. 123

10.7.4

Oscillation Circuit Constants ............................................................................................................ 123