R8C2K datasheet(9/471 Pages) RENESAS

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Voltage Detection Circuit .............................................................................................................. 32

6.1

VCC Input Voltage .................................................................................................................................. 39

6.1.1

Monitoring Vdet0 ............................................................................................................................... 39

6.1.2

Monitoring Vdet1 ............................................................................................................................... 39

6.1.3

Monitoring Vdet2 ............................................................................................................................... 39

6.2

Voltage Monitor 0 Reset ......................................................................................................................... 40

6.3

Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset ..................................................................... 41

6.4

Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset ..................................................................... 43

Programmable I/O Ports ............................................................................................................... 45

7.1

Functions of Programmable I/O Ports ..................................................................................................... 45

7.2

Effect on Peripheral Functions ................................................................................................................ 46

7.3

Pins Other than Programmable I/O Ports ................................................................................................ 46

7.4

Port settings ............................................................................................................................................. 58

7.5

Unassigned Pin Handling ........................................................................................................................ 68

Processor Mode ............................................................................................................................ 69

8.1

Processor Modes ...................................................................................................................................... 69

Bus ................................................................................................................................................ 70

10.

Clock Generation Circuit ............................................................................................................... 71

10.1

XIN Clock ............................................................................................................................................... 81

10.2

On-Chip Oscillator Clocks ...................................................................................................................... 82

10.2.1

Low-Speed On-Chip Oscillator Clock ................................................................................................ 82

10.2.2

High-Speed On-Chip Oscillator Clock ............................................................................................... 82

10.3

CPU Clock and Peripheral Function Clock ............................................................................................. 83

10.3.1

System Clock ...................................................................................................................................... 83

10.3.2

CPU Clock .......................................................................................................................................... 83

10.3.3

Peripheral Function Clock (f1, f2, f4, f8, and f32) ............................................................................. 83

10.3.4

fOCO ................................................................................................................................................... 83

10.3.5

fOCO40M ........................................................................................................................................... 83

10.3.6

fOCO-F ............................................................................................................................................... 83

10.3.7

fOCO-S ............................................................................................................................................... 83

10.3.8

fOCO128 ............................................................................................................................................. 83

10.4

Power Control .......................................................................................................................................... 84

10.4.1

Standard Operating Mode ................................................................................................................... 84

10.4.2

Wait Mode .......................................................................................................................................... 86

10.4.3

Stop Mode ........................................................................................................................................... 89

10.5

Oscillation Stop Detection Function ....................................................................................................... 92

10.5.1

How to Use Oscillation Stop Detection Function ............................................................................... 92

10.6

Notes on Clock Generation Circuit ......................................................................................................... 95

10.6.1

Stop Mode ........................................................................................................................................... 95

10.6.2

Wait Mode .......................................................................................................................................... 95

10.6.3

Oscillation Stop Detection Function ................................................................................................... 95

10.6.4

Oscillation Circuit Constants .............................................................................................................. 95

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