M16C26A Datasheet, PDF (10/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

9.2 Interrupts and Interrupt Vector .................................................................................... 64
9.2.1 Fixed Vector Tables .............................................................................................. 64
9.2.2 Relocatable Vector Tables ................................................................................... 65
9.3 Interrupt Control .......................................................................................................... 66
9.3.1 I Flag .................................................................................................................... 69
9.3.2 IR Bit .................................................................................................................... 69
9.3.3 ILVL2 to ILVL0 Bits and IPL ................................................................................. 69
9.4 Interrupt Sequence ...................................................................................................... 70
9.4.1 Interrupt Response Time...................................................................................... 71
9.4.2 Variation of IPL when Interrupt Request is Accepted ........................................... 71
9.4.3 Saving Registers .................................................................................................. 72
9.4.4 Returning from an Interrupt Routine .................................................................... 74
9.5 Interrupt Priority ........................................................................................................... 74
9.5.1 Interrupt Priority Resolution Circuit ...................................................................... 74
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9.6 INT Interrupt ................................................................................................................ 76
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9.7 NMI Interrupt ............................................................................................................... 77
9.8 Key Input Interrupt ....................................................................................................... 77
9.9 Address Match Interrupt .............................................................................................. 78
10. Watchdog Timer ______________________________ 80
10.1 Count Source Protective Mode ................................................................................. 81
11. DMAC ______________________________________ 82
11.1 Transfer Cycles......................................................................................................... 87
11.2. DMA Transfer Cycles ................................................................................................ 89
11.3 DMA Enable............................................................................................................... 90
11.4 DMA Request ............................................................................................................ 90
11.5 Channel Priority and DMA Transfer Timing .............................................................. 91
12. Timer _______________________________________ 92
12.1 Timer A ..................................................................................................................... 94
12.1.1. Timer Mode ....................................................................................................... 97
12.1.2. Event Counter Mode ......................................................................................... 98
12.1.3. One-shot Timer Mode ..................................................................................... 103
12.1.4. Pulse Width Modulation (PWM) Mode ............................................................ 105
12.2 Timer B ................................................................................................................... 108
12.2.1 Timer Mode ..................................................................................................... 111
12.2.2 Event Counter Mode ........................................................................................ 112
12.2.3 Pulse Period and Pulse Width Measurement Mode ....................................... 113
12.2.4 A/D Trigger Mode ............................................................................................ 115
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