A - 2

6.1.2

Monitoring Vdet1 ............................................................................................................................... 40

6.1.3

Monitoring Vdet2 ............................................................................................................................... 40

6.2

Voltage Monitor 0 Reset ......................................................................................................................... 41

6.3

Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset ..................................................................... 42

6.4

Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset ..................................................................... 44

7.

Comparator ................................................................................................................................... 46

7.1

Overview ................................................................................................................................................. 46

7.2

Register Description ................................................................................................................................ 48

7.3

Monitoring Comparison Results ............................................................................................................. 55

7.3.1

Monitoring Comparator 1 ................................................................................................................... 55

7.3.2

Monitoring Comparator 2 ................................................................................................................... 55

7.4

Functional Description ............................................................................................................................ 56

7.4.1

Comparator 1 ...................................................................................................................................... 56

7.4.2

Comparator 2 ...................................................................................................................................... 59

7.5

Comparator 1 and Comparator 2 Interrupts ............................................................................................ 62

7.5.1

Non-Maskable Interrupts .................................................................................................................... 62

7.5.2

Maskable Interrupts ............................................................................................................................ 62

7.6

Adjusting Internal Reference Voltage (Vref) .......................................................................................... 63

8.

I/O Ports ........................................................................................................................................ 65

8.1

Functions of I/O Ports ............................................................................................................................. 65

8.2

Effect on Peripheral Functions ................................................................................................................ 66

8.3

Pins Other than Programmable I/O Ports ................................................................................................ 66

8.4

Port Setting .............................................................................................................................................. 75

8.5

Unassigned Pin Handling ........................................................................................................................ 83

8.6

Notes on I/O Ports ................................................................................................................................... 84

8.6.1

Port P4_3, P4_4 .................................................................................................................................. 84

9.

Processor Mode ............................................................................................................................ 85

9.1

Processor Modes ...................................................................................................................................... 85

10.

Bus ................................................................................................................................................ 86

11.

Clock Generation Circuit ............................................................................................................... 87

11.1

On-Chip Oscillator Clocks ...................................................................................................................... 96

11.1.1

Low-Speed On-Chip Oscillator Clock ................................................................................................ 96

11.1.2

High-Speed On-Chip Oscillator Clock ............................................................................................... 96

11.2

XCIN Clock ............................................................................................................................................. 97

11.3

CPU Clock and Peripheral Function Clock ............................................................................................. 98

11.3.1

System Clock ...................................................................................................................................... 98

11.3.2

CPU Clock .......................................................................................................................................... 98

11.3.3

Peripheral Function Clock (f1, f2, f4, f8, and f32) ............................................................................. 98

11.3.4

fOCO ................................................................................................................................................... 98

11.3.5

fOCO-F ............................................................................................................................................... 98

11.3.6

fOCO-S ............................................................................................................................................... 98

11.3.7

fC4 and fC32 ....................................................................................................................................... 98

11.4

Power Control .......................................................................................................................................... 99

11.4.1

Standard Operating Mode ................................................................................................................... 99