1069
BCRH—Bus Control Register H
H'FED4
Bus Controller
7
ICIS1
1
R/W
6
ICIS0
1
R/W
5
BRSTRM
0
R/W
4
BRSTS1
1
R/W
3
BRSTS0
0
R/W
0
RMTS0
0
R/W
2
RMTS2
0
R/W
1
RMTS1
0
R/W
No idle cycle is inserted when an external read cycle
follows an external read cycle of another area.
An idle cycle is inserted when an external read cycle
follows an external read cycle of another area. (Initial value)
0
1
0
Idle cycle insertion 1
No idle cycle is inserted when an external read cycle follows
an external write cycle.
An idle cycle is inserted when an external read cycle follows
an external write cycle. (Initial value)
1
Idle cycle insertion 0
Area 0 is basic bus interface. (Initial value)
Area 0 is burst ROM interface.
0
1
Burst ROM enable
Burst cycle = 1 state.
Burst cycle = 2 states.
0
1
Burst access = 4 words max.
Burst access = 8 words max.
0
1
Burst cycle select 1
RAM type select
Burst cycle select 0
Note: When all areas selected in the DRAM area are set for 8-bit access, the PF2
pin can be used as an I/O port or BREQO or WAIT. When set for contiguous
DRAM the bus widths for areas 2 to 5 and the number of access states
(number of programmable waits) must be set to the same values. Do not
attempt to set combinations other than those shown in the table.
0
1
0
RMTS0 Area
2
RMTS1
RMTS2
Area 3
Area 4
Area 5
0
0
1
1
1
1
1
Normal area
DRAM area
Normal area
DRAM area
Normal area
DRAM area
Contiguous DRAM area
Bit
Initial value
R/W
:
:
:
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 ...