Table of Contents
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14.13.4
Changing an Interrupt Source ......................................................................................... 221
14.13.5
Rewriting the Interrupt Control Register .......................................................................... 222
14.13.6
Instruction to Rewrite the Interrupt Control Register ....................................................... 222
INT Interrupt .................................................................................................................... 223
14.13.7
15. Watchdog Timer....................................................................................................... 224
15.1
Introduction ............................................................................................................................... 224
15.2
Registers................................................................................................................................... 225
15.2.1
Voltage Monitor 2 Control Register (VW2C) .................................................................... 225
15.2.2
Count Source Protection Mode Register (CSPR) ........................................................... 226
15.2.3
Watchdog Timer Refresh Register (WDTR) .................................................................... 227
15.2.4
Watchdog Timer Start Register (WDTS) ......................................................................... 227
15.2.5
Watchdog Timer Control Register (WDC) ....................................................................... 228
15.3
Optional Function Select Area .................................................................................................. 229
15.3.1
Optional Function Select Address 1 (OFS1) ................................................................... 229
15.4
Operations ................................................................................................................................ 230
15.4.1
Count Source Protection Mode Disabled ........................................................................ 230
15.4.2
Count Source Protection Mode Enabled ......................................................................... 231
15.5
Interrupts................................................................................................................................... 232
15.6
Notes on the Watchdog Timer .................................................................................................. 233
16. DMAC ...................................................................................................................... 234
16.1
Introduction ............................................................................................................................... 234
16.2
Registers................................................................................................................................... 236
16.2.1
DMAi Source Pointer (SARi) (i = 0 to 3) .......................................................................... 237
16.2.2
DMAi Destination Pointer (DARi) (i = 0 to 3) ................................................................... 237
16.2.3
DMAi Transfer Counter (TCRi) (i = 0 to 3) ....................................................................... 238
16.2.4
DMAi Control Register (DMiCON) (i = 0 to 3) ................................................................. 239
16.2.5
DMAi Source Select Register (DMiSL) (i = 0 to 3) .......................................................... 240
16.3
Operations ................................................................................................................................ 243
16.3.1
DMA Enabled .................................................................................................................. 243
16.3.2
DMA Request .................................................................................................................. 243
16.3.3
Transfer Cycles ............................................................................................................... 244
16.3.4
DMAC Transfer Cycles .................................................................................................... 246
16.3.5
Single Transfer Mode ...................................................................................................... 247
16.3.6
Repeat Transfer Mode .................................................................................................... 248
16.3.7
Channel Priority and DMA Transfer Timing ..................................................................... 249
16.4
Interrupts................................................................................................................................... 250
16.5
Notes on DMAC........................................................................................................................ 251
16.5.1
Write to the DMAE Bit in the DMiCON Register (i = 0 to 3) ............................................. 251
16.5.2
Changing the DMA Request Source ............................................................................... 251
A - 7
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