User’s Manual U12688EJ4V0UM00
15
6.3.6
DMA trigger factor registers 0 to 3 (DTFR0 to DTFR3) ............................................................... 171
6.3.7
DMA disable status register (DDIS)............................................................................................. 173
6.3.8
DMA restart register (DRST) ....................................................................................................... 173
6.3.9
Flyby transfer data wait control register (FDW) ........................................................................... 174
6.4
DMA Bus States........................................................................................................................ 175
6.4.1
Types of bus states ..................................................................................................................... 175
6.4.2
DMAC state transition.................................................................................................................. 178
6.5
Transfer Mode........................................................................................................................... 179
6.5.1
Single transfer mode ................................................................................................................... 179
6.5.2
Single-step transfer mode ........................................................................................................... 180
6.5.3
Block transfer mode..................................................................................................................... 180
6.6
Transfer Types.......................................................................................................................... 181
6.6.1
Two-cycle transfer ....................................................................................................................... 181
6.6.2
Flyby transfer............................................................................................................................... 185
6.7
Transfer Objects ....................................................................................................................... 189
6.7.1
Transfer type and transfer objects............................................................................................... 189
6.7.2
External bus cycle during DMA transfer ...................................................................................... 189
6.8
DMA Channel Priorities............................................................................................................ 190
6.9
Next Address Setting Function............................................................................................... 190
6.10 DMA Transfer Start Factors..................................................................................................... 191
6.11 Interrupting DMA Transfer....................................................................................................... 192
6.11.1
Interruption factors....................................................................................................................... 192
6.11.2
Forcible interruption..................................................................................................................... 192
6.12 Terminating DMA Transfer ...................................................................................................... 192
6.12.1
DMA transfer end interrupt .......................................................................................................... 192
6.12.2
Terminal count output.................................................................................................................. 192
6.12.3
Forcible termination ..................................................................................................................... 193
6.13 Boundary of Memory Area ...................................................................................................... 194
6.14 Transfer of Misalign Data ........................................................................................................ 194
6.15 Clocks of DMA Transfer........................................................................................................... 194
6.16 Maximum Response Time to DMA Request .......................................................................... 194
6.17 One Time Single Transfer with DMARQ0 to DMARQ3 .......................................................... 196
6.18 Bus Arbitration for CPU ........................................................................................................... 197
6.19 Precaution ................................................................................................................................. 197
CHAPTER 7 INTERRUPT/EXCEPTION PROCESSING FUNCTION ................................................. 199
7.1
Features..................................................................................................................................... 199
7.2
Non-Maskable Interrupt ........................................................................................................... 204
7.2.1
Operation..................................................................................................................................... 205
7.2.2
Restore ........................................................................................................................................ 207
7.2.3
Non-maskable interrupt status flag (NP) ..................................................................................... 208
7.2.4
Noise elimination ......................................................................................................................... 208
7.2.5
Edge detection function ............................................................................................................... 208
7.3
Maskable Interrupts.................................................................................................................. 209
7.3.1
Operation..................................................................................................................................... 209
7.3.2
Restore ........................................................................................................................................ 211
7.3.3
Priorities of maskable interrupts .................................................................................................. 212
7.3.4
Interrupt control register (xxICn).................................................................................................. 216
Содержание V850E/MS1 UPD703100
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