User’s Manual U12688EJ4V0UM00
14
4.5.2
Bus sizing function....................................................................................................................... 108
4.5.3
Bus width ..................................................................................................................................... 109
4.6
Wait Function ............................................................................................................................ 113
4.6.1
Programmable wait function ........................................................................................................ 113
4.6.2
External wait function................................................................................................................... 114
4.6.3
Relationship between programmable wait and external wait....................................................... 114
4.6.4
Bus cycles in which the wait function is valid............................................................................ ... 115
4.7
Idle State Insertion Function ................................................................................................... 117
4.8
Bus Hold Function.................................................................................................................... 119
4.8.1
Outline of function........................................................................................................................ 119
4.8.2
Bus hold procedure...................................................................................................................... 120
4.8.3
Operation in power save mode .................................................................................................... 120
4.8.4
Bus hold timing ............................................................................................................................ 121
4.9
Bus Priority Order..................................................................................................................... 122
4.10 Boundary Operation Conditions ............................................................................................. 122
4.10.1
Program space ............................................................................................................................ 122
4.10.2
Data space................................................................................................................................... 123
CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION ................................................................. 125
5.1
SRAM, External ROM, External I/O Interface.......................................................................... 125
5.1.1
SRAM connections ...................................................................................................................... 125
5.1.2
SRAM, external ROM, external I/O access.................................................................................. 126
5.2
Page ROM Controller (ROMC) ................................................................................................. 130
5.2.1
Features....................................................................................................................................... 130
5.2.2
Page ROM connections ............................................................................................................... 130
5.2.3
On-page/off-page judgment ......................................................................................................... 132
5.2.4
Page ROM configuration register (PRC)...................................................................................... 134
5.2.5
Page ROM access ....................................................................................................................... 135
5.3
DRAM Controller....................................................................................................................... 136
5.3.1
Features....................................................................................................................................... 136
5.3.2
DRAM connections ...................................................................................................................... 137
5.3.3
Address multiplex function........................................................................................................... 138
5.3.4
DRAM configuration registers 0 to 3 (DRC0 to DRC3) ............................................................... 139
5.3.5
DRAM type configuration register (DTC) ..................................................................................... 142
5.3.6
DRAM access .............................................................................................................................. 143
5.3.7
DRAM access during DMA flyby transfer..................................................................................... 151
5.3.8
Refresh control function............................................................................................................... 153
5.3.9
Self-refresh functions................................................................................................................... 158
CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER).................................................................... 161
6.1
Features..................................................................................................................................... 161
6.2
Configuration ............................................................................................................................ 162
6.3
Control Registers...................................................................................................................... 163
6.3.1
DMA source address registers 0 to 3 (DSA0 to DSA3) ............................................................... 163
6.3.2
DMA destination address registers 0 to 3 (DDA0 to DDA3) ........................................................ 165
6.3.3
DMA byte count registers 0 to 3 (DBC0 to DBC3) ....................................................................... 167
6.3.4
DMA addressing control registers 0 to 3 (DADC0 to DADC3) ..................................................... 168
6.3.5
DMA channel control registers 0 to 3 (DCHC0 to DCHC3).......................................................... 170
Summary of Contents for V850E/MS1 UPD703100
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