HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 163

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6.1.4
Table 6.2 summarizes the registers of the bus controller.
Table 6.2
Notes: 1. Lower 16 bits of the address.
Name
Wait
Bus request
Bus request
acknowledge
Bus request output
Name
Bus width control register
Access state control register
Wait control register H
Wait control register L
Bus control register H
Bus control register L
Memory control register
DRAM control register
Refresh timer counter
Refresh time constant register
2. Determined by the MCU operating mode.
Register Configuration
Bus Controller Registers
Symbol
WAIT
BREQ
BACK
BREQO
I/O
Input
Input
Output
Output
Abbreviation
ABWCR
ASTCR
WCRH
WCRL
BCRH
BCRL
MCR
DRAMCR
RTCNT
RTCOR
Function
Wait request signal when accessing external 3-
state access space.
Request signal for release of bus to external
device.
Acknowledge signal indicating that bus has been
released.
External bus request signal used when internal
bus master accesses external space when
external bus is released.
Rev.4.00 Sep. 07, 2007 Page 133 of 1210
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
Reset
H'FF/H'00 *
H'FF
H'FF
H'FF
H'D0
H'3C
H'00
H'00
H'00
H'FF
REJ09B0245-0400
2
Address *
H'FED0
H'FED1
H'FED4
H'FED6
H'FED7
H'FED8
H'FED2
H'FED3
H'FED5
H'FED9
1