Hitachi H8S/2670, Reference Manual

Page: 206 / 647

189
Port Description Pins
Modes
1, 2, 5, 6
Mode
4
Mode
7
Port F
•
8-bit I/O
port PF1/
UCAS
/
IRQ14
When areas 2 to 5 are all
normal space (after reset): I/O
port also functioning as
IRQ14
interrupt input
When any of areas 2 to 5 is
DRAM space: Dual function as
IRQ14
interrupt input and
UCAS
output
When EXPE = 0 (after reset), or
when EXPE = 1 and areas 2 to
5 are all normal space: I/O port
also functioning as
IRQ14
interrupt input
When EXPE = 1 and any of
areas 2 to 5 is DRAM space:
Dual function as
IRQ14
interrupt input and
UCAS
output
PF0/
WAIT
When WAITE = 0 (after reset):
I/O port
When WAITE = 1:
WAIT
input
When EXPE = 0 (after reset), or
when EXPE = 1 and WAITE =
0: I/O port
When EXPE = 1 and WAITE =
1:
WAIT
input
Port G
•
7-bit I/O
port PG6/
BREQ
When BRLE = 0 (after reset):
I/O port
When BRLE = 1:
BREQ
input
When EXPE = 0 (after reset), or
when EXPE = 1 and BRLE = 0:
I/O port
When EXPE = 1 and BRLE = 1:
BREQ
input
PG5/
BACK
When BRLE = 0 (after reset):
I/O port
When BRLE = 1:
BACK
output
When EXPE = 0 (after reset), or
when EXPE = 1 and BRLE = 0:
I/O port
When EXPE = 1 and BRLE = 1:
BACK
output
PG4/
BREQO
When BRLE = 0 (after reset), or
when BRLE = 1 and BREQOE
= 0: I/O port
When BRLE = 1 and BREQOE
= 1:
BREQO
output
When EXPE = 0 (after reset), or
when EXPE1 = 1 and BRLE =
0, or when EXPE = 1, BRLE =
1, and BREQOE = 0: I/O port
When EXPE = 1, BRLE = 1,
and BREQOE = 1:
BREQO
output
PG3/
CS3
When CS3E = 0 (after reset):
I/O port
When CS3E = 1 and DDR = 0:
Input port
When CS3E = 1 and DDR = 1:
CS3
output
When EXPE = 0 (after reset), or
when EXPE1 = 1 and CS3E =
0: I/O port
When EXPE = 1, CS3E = 1,
and DDR = 0: Input port
When EXPE = 1, CS3E = 1,
and DDR = 1:
CS3
output