HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 164

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

7.2 Register Descriptions
7.2.1 Refresh Control Register (RFSHCR)
RFSHCR is an 8-bit readable/writable register that selects the operating mode of the refresh
controller.
RFSHCR is initialized to H'02 by a reset and in hardware standby mode.
Bit
Initial value
Read/Write
Self-refresh mode
Selects self-refresh mode
SRFMD
R/W
7
0
PSRAM enable and DRAM enable
These bits enable or disable connection of pseudo-static RAM and DRAM
PSRAME
R/W
6
0
DRAME
R/W
5
0
Strobe mode select
Selects 2CAS or 2WE strobing of DRAM
CAS/WE
150
R/W
4
0
Address multiplex mode select
Selects the number of column address bits
M9/M8
R/W
3
0
Refresh pin enable
Enables refresh signal output
from the refresh pin
RFSHE
R/W
2
0
Reserved bit
—
—
1
1
Refresh cycle
enable
Enables or
disables
insertion of
refresh cycles
RCYCE
R/W
0
0