HD6432646 Hitachi, HD6432646 Datasheet - Page 177

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

7.1.3
Table 7-1 summarizes the pins of the bus controller.
Table 7-1
Name
Address strobe
Read
High write
Low write
Wait
7.1.4
Table 7-2 summarizes the registers of the bus controller.
Table 7-2
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
Pin function control register
Notes: *1 Lower 16 bits of the address.
*2 Determined by the MCU operating mode.
Pin Configuration
Register Configuration
Bus Controller Pins
Bus Controller Registers
Symbol
AS
RD
HWR
LWR
WAIT
Abbreviation
ABWCR
ASTCR
WCRH
WCRL
BCRH
BCRL
PFCR
I/O
Output
Output
Output
Output
Input
Function
Strobe signal indicating that address output on address
bus is enabled.
Strobe signal indicating that external space is being
read.
Strobe signal indicating that external space is to be
written, and upper half (D15 to D8) of data bus is
enabled.
Strobe signal indicating that external space is to be
written, and lower half (D7 to D0) of data bus is enabled.
Wait request signal used when accessing external
3-state access space.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
H'FF/H'00
H'FF
H'FF
H'FF
H'D0
H'08
H'0D/H'00
* 2
Address
H'FED0
H'FED1
H'FED2
H'FED3
H'FED4
H'FED5
H'FDEB
*1
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