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User’s Manual U15195EJ5V0UD
4.3.1
Chip select control function.......................................................................................................... 82
4.4
Bus Cycle Type Control Function ........................................................................................... 85
4.5
Bus Access ................................................................................................................................ 86
4.5.1
Number of access clocks............................................................................................................. 86
4.5.2
Bus sizing function....................................................................................................................... 87
4.5.3
Bus width ..................................................................................................................................... 88
4.6
Wait Function............................................................................................................................. 94
4.6.1
Programmable wait function ........................................................................................................ 94
4.6.2
External wait function .................................................................................................................. 96
4.6.3
Relationship between programmable wait and external wait ....................................................... 96
4.7
Idle State Insertion Function.................................................................................................... 97
4.8
Bus Priority Order ..................................................................................................................... 98
4.9
Boundary Operation Conditions.............................................................................................. 99
4.9.1
Program space ............................................................................................................................ 99
4.9.2
Data space .................................................................................................................................. 99
CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION ................................................................ 100
5.1
SRAM, External ROM, External I/O Interface........................................................................ 100
5.1.1
Features .................................................................................................................................... 100
5.1.2
SRAM, external ROM, external I/O access ............................................................................... 101
CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER) ................................................................... 105
6.1
Features ................................................................................................................................... 105
6.2
Configuration........................................................................................................................... 106
6.3
Control Registers .................................................................................................................... 107
6.3.1
DMA source address registers 0 to 3 (DSA0 to DSA3) ............................................................. 107
6.3.2
DMA destination address registers 0 to 3 (DDA0 to DDA3)....................................................... 109
6.3.3
DMA transfer count registers 0 to 3 (DBC0 to DBC3)................................................................ 111
6.3.4
DMA addressing control registers 0 to 3 (DADC0 to DADC3) ................................................... 112
6.3.5
DMA channel control registers 0 to 3 (DCHC0 to DCHC3)........................................................ 114
6.3.6
DMA disable status register (DDIS)........................................................................................... 116
6.3.7
DMA restart register (DRST) ..................................................................................................... 116
6.3.8
DMA trigger factor registers 0 to 3 (DTFR0 to DTFR3) ............................................................. 117
6.4
Transfer Modes........................................................................................................................ 120
6.4.1
Single transfer mode ................................................................................................................. 120
6.4.2
Single-step transfer mode.......................................................................................................... 122
6.4.3
Block transfer mode................................................................................................................... 123
6.5
Transfer Types......................................................................................................................... 123
6.5.1
Two-cycle transfer ..................................................................................................................... 123
6.6
Transfer Target ........................................................................................................................ 124
6.6.1
Transfer type and transfer target ............................................................................................... 124
6.6.2
External bus cycles during DMA transfer (two-cycle transfer) ................................................... 125
6.7
DMA Channel Priorities .......................................................................................................... 125
6.8
Next Address Setting Function.............................................................................................. 125
6.9
DMA Transfer Start Factors ................................................................................................... 127
6.10
Forcible Suspension ............................................................................................................... 128
6.11
DMA Transfer End ................................................................................................................... 128