M16C28 Datasheet, PDF (10/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

9.2 Interrupts and Interrupt Vector ........................................................................................ 70
9.2.1 Fixed Vector Tables .................................................................................................. 70
9.2.2 Relocatable Vector Tables ........................................................................................ 71
9.3 Interrupt Control .............................................................................................................. 72
9.3.1 I Flag ........................................................................................................................ 75
9.3.2 IR Bit ........................................................................................................................ 75
9.3.3 ILVL2 to ILVL0 Bits and IPL...................................................................................... 75
9.4 Interrupt Sequence ......................................................................................................... 76
9.4.1 Interrupt Response Time .......................................................................................... 77
9.4.2 Variation of IPL when Interrupt Request is Accepted ............................................... 77
9.4.3 Saving Registers ...................................................................................................... 78
9.4.4 Returning from an Interrupt Routine ......................................................................... 80
9.5 Interrupt Priority .............................................................................................................. 80
9.5.1 Interrupt Priority Resolution Circuit .......................................................................... 80
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9.6 INT Interrupt ................................................................................................................... 82
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9.7 NMI Interrupt ................................................................................................................... 83
9.8 Key Input Interrupt .......................................................................................................... 83
9.9 Address Match Interrupt ................................................................................................. 84
10. Watchdog Timer ...........................................................................................86
10.1 Count Source Protective Mode ..................................................................................... 87
11. DMAC ...........................................................................................................88
11.1 Transfer Cycles ............................................................................................................ 93
11.1.1 Effect of Source and Destination Addresses ......................................................... 93
11.1.2 Effect of Software Wait .......................................................................................... 93
11.2. DMA Transfer Cycles ................................................................................................... 95
11.3 DMA Enable .................................................................................................................. 96
11.4 DMA Request ................................................................................................................ 96
11.5 Channel Priority and DMA Transfer Timing .................................................................. 97
12. Timer ............................................................................................................98
12.1 Timer A ...................................................................................................................... 100
12.1.1 Timer Mode .......................................................................................................... 103
12.1.2 Event Counter Mode ............................................................................................ 104
12.1.3 One-shot Timer Mode .......................................................................................... 109
12.1.4 Pulse Width Modulation (PWM) Mode ................................................................. 111
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