HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 127
HD6433045
Manufacturer Part Number
HD6433045
Description
Hitachi Single-Chip Microcomputer
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6433045.pdf
(867 pages)
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6.1.3 Input/Output Pins
Table 6-1 summarizes the bus controller’s input/output pins.
Table 6-1 Bus Controller Pins
Name
Chip select 0 to 7
Address strobe
Read
High write
Low write
Wait
Bus request
Bus acknowledge
6.1.4 Register Configuration
Table 6-2 summarizes the bus controller’s registers.
Table 6-2 Bus Controller Registers
Address*
H'FFEC
H'FFED
H'FFEE
H'FFEF
H'FFF3
H'FF5F
Note: * Lower 16 bits of the address.
Name
Bus width control register
Access state control register
Wait control register
Wait state controller enable
register
Bus release control register
Chip select control register
Abbreviation
CS
AS
RD
HWR
LWR
WAIT
BREQ
BACK
0
to CS
7
I/O
Output
Output
Output
Output
Output
Input
Input
Output
Abbrevi-
ation
ABWCR
ASTCR
WCR
WCER
BRCR
CSCR
Function
Strobe signals selecting areas 0 to 7
Strobe signal indicating valid address output on the
address bus
Strobe signal indicating reading from the external
address space
Strobe signal indicating writing to the external
address space, with valid data on the upper data
bus (D
Strobe signal indicating writing to the external
address space, with valid data on the lower data
bus (D
Wait request signal for access to external three-
state-access areas
Request signal for releasing the bus to an external
device
Acknowledge signal indicating the bus is released
to an external device
113
15
7
to D
R/W
R/W
R/W
R/W
R/W
R/W
R/W
to D
0
8
)
)
Modes 1, 3, 5, 6
H'FF
H'FF
H'F3
H'FF
H'FE
H'0F
Initial Value
Modes 2, 4, 7
H'00
H'FF
H'F3
H'FF
H'FE
H'0F
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