287
5.17
Port H
5.17.1
Overview
Port H is a 4-bit I/O port. Port H pins also function as bus control signal output pins (
CS7
to
CS4
and
OE
) and interrupt signal input pins (
IRQ7
and
IRQ6
).
Figure 5.16 shows the port H pin configuration.
PH3 /
CS7
/
OE
/
IRQ7
PH2 /
CS6
/
IRQ6
PH1 /
CS5
PH0 /
CS4
Port H
Port H pins
Pin functions in modes 1, 2, 4, 5, 6, and 7
PH3 (I/O) /
CS7
(output) /
OE
(output) /
IRQ7
(input)
PH2 (I/O) /
CS6
(output) /
IRQ6
(input)
PH1 (I/O) /
CS5
(output)
PH0 (I/O) /
CS4
(output)
Figure 5.16 Port H Pin Functions
5.17.2
Register Configuration
Table 5.36 shows the port H register configuration.
Table 5.36
Port H Registers
Name
Abbreviation
R/W
Initial Value
Address
*
Port H data direction register
PHDDR
W
H'00
H'FF74
Port H data register
PHDR
R/W
H'00
H'FF72
Port H register
PORTH
R
Undefined
H'FF70
Port function control register 0
PFCR0
R/W
H'FF
H'FE32
Port function control register 2
PFCR2
R/W
H'0E
H'FE34
Note:
*
Lower 16 bits of the address.
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