135
Name
Symbol
I/O
Function
Wait
WAIT
Input
Wait request signal when accessing external 3-state
access space.
Bus request
BREQ
Input
Request signal that releases bus to external device.
Bus request
acknowledge
BACK
Output
Acknowledge signal indicating that bus has been
released.
Bus request output
BREQO
Output
External bus request signal used when internal bus
master accesses external space when external bus is
released.
7.1.4
Register Configuration
Table 7-2 summarizes the registers of the bus controller.
Table 7-2
Bus Controller Registers
Initial Value
Name
Abbreviation
R/W
Power-On
Reset
Manual
Reset
Address
*
1
Bus width control register
ABWCR
R/W
H'FF/H'00
*
2
Retained
H'FED0
Access state control register
ASTCR
R/W
H'FF
Retained
H'FED1
Wait control register H
WCRH
R/W
H'FF
Retained
H'FED2
Wait control register L
WCRL
R/W
H'FF
Retained
H'FED3
Bus control register H
BCRH
R/W
H'D0
Retained
H'FED4
Bus control register L
BCRL
R/W
H'08
Retained
H'FED5
Pin function control register
PFCR
R/W
H'0D/H'00
Retained
H'FDEB
Memory control register
MCR
R/W
H'00
Retained
H'FED6
DRAM control register
DRAMCR
R/W
H'00
Retained
H'FED7
Refresh timer counter
RTCNT
R/W
H'00
Retained
H'FED8
Refresh time constant register
RTCOR
R/W
H'FF
Retained
H'FED9
Notes: 1. Lower 16 bits of the address.
2. Determined by the MCU operating mode.
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...