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7.1.3
Pin Configuration
Table 7-1 summarizes the pins of the bus controller.
Table 7-1
Bus Controller Pins
Name
Address strobe
Read
High write
Low write
Wait
7.1.4
Register Configuration
Table 7-2 summarizes the registers of the bus controller.
Table 7-2
Bus Controller Registers
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.
Symbol
I/O
AS
Output
RD
Output
HWR
Output
LWR
Output
WAIT
Input
Abbreviation
ABWCR
ASTCR
WCRH
WCRL
BCRH
BCRL
PFCR
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
Initial Value
R/W
H'FF/H'00
R/W
H'FF
R/W
H'FF
R/W
H'FF
R/W
H'D0
R/W
H'08
R/W
H'0D/H'00
*1
Address
*2
H'FED0
H'FED1
H'FED2
H'FED3
H'FED4
H'FED5
H'FDEB
143
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