R8C28 データシートの表示（PDF） - Renesas Electronics
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R8C28 Datasheet PDF : 471 Pages
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6. Voltage Detection Circuit .............................................................................................................. 32
6.1 VCC Input Voltage .................................................................................................................................. 43
6.1.1 Monitoring Vdet0 ............................................................................................................................... 43
6.1.2 Monitoring Vdet1 ............................................................................................................................... 43
6.1.3 Monitoring Vdet2 ............................................................................................................................... 43
6.2 Voltage Monitor 0 Reset (For N, D Version only) .................................................................................. 44
6.3 Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset (N, D Version) ............................................ 45
6.4 Voltage Monitor 1 Reset (J, K Version) .................................................................................................. 47
6.5 Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset ..................................................................... 48
7. Programmable I/O Ports ............................................................................................................... 50
7.1 Functions of Programmable I/O Ports ..................................................................................................... 50
7.2 Effect on Peripheral Functions ................................................................................................................ 51
7.3 Pins Other than Programmable I/O Ports ................................................................................................ 51
7.4 Port Settings ............................................................................................................................................ 61
7.5 Unassigned Pin Handling ........................................................................................................................ 69
8. Processor Mode ............................................................................................................................ 70
8.1 Processor Modes ...................................................................................................................................... 70
9. Bus ................................................................................................................................................ 71
10. Clock Generation Circuit ............................................................................................................... 72
10.1 XIN Clock ............................................................................................................................................... 82
10.2 On-Chip Oscillator Clocks ...................................................................................................................... 83
10.2.1 Low-Speed On-Chip Oscillator Clock ................................................................................................ 83
10.2.2 High-Speed On-Chip Oscillator Clock ............................................................................................... 83
10.3 XCIN Clock (For N, D Version Only) .................................................................................................... 84
10.4 CPU Clock and Peripheral Function Clock ............................................................................................. 85
10.4.1 System Clock ...................................................................................................................................... 85
10.4.2 CPU Clock .......................................................................................................................................... 85
10.4.3 Peripheral Function Clock (f1, f2, f4, f8, and f32) ............................................................................. 85
10.4.4 fOCO ................................................................................................................................................... 85
10.4.5 fOCO40M ........................................................................................................................................... 85
10.4.6 fOCO-F ............................................................................................................................................... 85
10.4.7 fOCO-S ............................................................................................................................................... 85
10.4.8 fC4 and fC32 ....................................................................................................................................... 86
10.4.9 fOCO128 ............................................................................................................................................. 86
10.5 Power Control .......................................................................................................................................... 87
10.5.1 Standard Operating Mode ................................................................................................................... 87
10.5.2 Wait Mode .......................................................................................................................................... 89
10.5.3 Stop Mode ........................................................................................................................................... 93
10.6 Oscillation Stop Detection Function ....................................................................................................... 97
10.6.1 How to Use Oscillation Stop Detection Function ............................................................................... 97
10.7 Notes on Clock Generation Circuit ....................................................................................................... 101
10.7.1 Stop Mode ......................................................................................................................................... 101
10.7.2 Wait Mode ........................................................................................................................................ 101
10.7.3 Oscillation Stop Detection Function ................................................................................................. 101
10.7.4 Oscillation Circuit Constants ............................................................................................................ 101
A-2
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