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12.6.2
Relocatable Vector Tables ............................................................................................... 183
12.7
Interrupt Control........................................................................................................................ 185
12.7.1
Maskable Interrupt Control .............................................................................................. 185
12.7.2
Interrupt Sequence .......................................................................................................... 186
12.7.3
Interrupt Response Time ................................................................................................. 187
12.7.4
Variation of IPL When Interrupt Request is Accepted ..................................................... 187
12.7.5
Saving Registers ............................................................................................................. 188
12.7.6
Returning from an Interrupt Routine ................................................................................ 189
12.7.7
Interrupt Priority ............................................................................................................... 189
12.7.8
Interrupt Priority Level Select Circuit ............................................................................... 189
12.7.9
Multiple Interrupts ............................................................................................................ 191
INT Interrupt.............................................................................................................................. 191
12.8
NMI Interrupt............................................................................................................................. 192
12.9
12.10
Key Input Interrupt .................................................................................................................... 192
12.11
Address Match Interrupt ........................................................................................................... 193
12.12
Non-Maskable Interrupt Source Discrimination ........................................................................ 194
12.13
Notes on Interrupts ................................................................................................................... 195
12.13.1
Reading Address 00000h ................................................................................................ 195
12.13.2
SP Setting ........................................................................................................................ 195
NMI Interrupt .................................................................................................................... 195
12.13.3
12.13.4
Changing an Interrupt Source ......................................................................................... 196
12.13.5
Rewriting the Interrupt Control Register .......................................................................... 197
12.13.6
Instruction to Rewrite the Interrupt Control Register ....................................................... 197
INT Interrupt .................................................................................................................... 198
12.13.7
13. Watchdog Timer ................................................................................... 199
13.1
Introduction ............................................................................................................................... 199
13.2
Registers................................................................................................................................... 201
13.2.1
Voltage Monitor 2 Control Register (VW2C) .................................................................... 202
13.2.2
Count Source Protection Mode Register (CSPR) ............................................................ 203
13.2.3
Watchdog Timer Refresh Register (WDTR) .................................................................... 203
13.2.4
Watchdog Timer Start Register (WDTS) .......................................................................... 204
13.2.5
Watchdog Timer Control Register (WDC) ....................................................................... 204
13.3
Optional Function Select Area .................................................................................................. 205
13.3.1
Optional Function Select Address 1 (OFS1) ................................................................... 205
13.3.2
Optional Function Select Address 2 (OFS2) ................................................................... 206
13.4
Operations ................................................................................................................................ 207
13.4.1
Refresh Operation Period ................................................................................................ 207
13.4.2
Count Source Protection Mode Disabled ........................................................................ 208
13.4.3
Count Source Protection Mode Enabled ......................................................................... 209
13.5
Interrupts................................................................................................................................... 210
A- 6
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