HD643303x Hitachi, HD643303x Datasheet - Page 118

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

6.1.3 Input/Output Pins
Table 6-1 summarizes the bus controller’s input/output pins.
Table 6-1 Bus Controller Pins
Name
Address strobe
Read
Write
Wait
6.1.4 Register Configuration
Table 6-2 summarizes the bus controller’s registers.
Table 6-2 Bus Controller Registers
Address*
H'FFED
H'FFEE
H'FFEF
Note: * Lower 16 bits of the address.
Name
Access state control register
Wait control register
Wait state controller enable register
Abbreviation
AS
RD
WR
WAIT
I/O
Output
Output
Output
Input
Function
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 data bus
Wait request signal for access to external three-
state-access areas
103
Abbreviation
ASTCR
WCR
WCER
R/W
R/W
R/W
R/W
Initial Value
H'FF
H'F3
H'FF