Hitachi H8S/2678 Series Reference Manual page 207

Port Description
Port G • 7-bit I/O
port
Port H • 4-bit I/O
port
190
Pins
PG2/CS2
PG1/CS1
PG0/CS0
PH3/CS7/OE/IRQ7
Modes Mode
1, 2, 5, 6
When CS2E = 0 (after reset):
I/O port
When CS2E = 1 and DDR = 0:
Input port
When CS2E = 1 and DDR = 1:
CS2 output
When CS1E = 0 (after reset):
I/O port
When CS1E = 1 and DDR = 0:
Input port
When CS1E = 1 and DDR = 1:
CS1 output
When CS0E = When CS0E =
1 and DDR = 1 1 and DDR = 0
(after reset): (after reset):
CS0 output
Input port
When CS0E = When CS0E =
0: I/O port 0: I/O port
When CS0E = When CS0E =
1 and DDR = 1 and DDR =
1: CS0 output
0: Input port
When OEE = 0 and CS7E = 0
(after reset), or when OEE = 1,
OES = 0, and CS7E = 0: I/O
port also functioning as IRQ7
interrupt input
When OEE = 0, CS7E = 1, and
DDR = 0, or when OEE = 1,
OES = 0, CS7E = 1, and DDR =
0: Input port also functioning as
IRQ7 interrupt input
When OEE = 0, CS7E = 1, and
DDR = 1, or when OEE = 1,
OES = 0, CS7E = 1, and DDR =
1: Dual function as IRQ7
interrupt input and CS7 output
When OEE = 1 and OES = 1:
Dual function as IRQ7 interrupt
input and OE output
4
When EXPE = 0 (after reset), or
when EXPE1 = 1 and CS2E =
0: I/O port
When EXPE = 1, CS2E = 1,
and DDR = 0: Input port
When EXPE = 1, CS2E = 1,
and DDR = 1: CS2 output
When EXPE = 0 (after reset), or
when EXPE1 = 1 and CS1E =
0: I/O port
When EXPE = 1, CS1E = 1,
and DDR = 0: Input port
When EXPE = 1, CS1E = 1,
and DDR = 1: CS1 output
When EXPE = 0 (after reset), or
when EXPE1 = 1 and CS0E =
0: I/O port
When EXPE = 1, CS0E = 1,
and DDR = 0: Input port
When EXPE = 1, CS0E = 1,
and DDR = 1: CS0 output
When EXPE = 0 (after reset), or
when EXPE = 1, OEE = 0, and
CS7E = 0, or when EXPE = 1,
OEE = 1, OES = 0, and CS7E =
0: I/O port also functioning as
IRQ7 interrupt input
When EXPE = 1, OEE = 0,
CS7E = 1, and DDR = 0, or
when EXPE = 1, OEE = 1, OES
= 0, CS7E = 1, and DDR = 0:
Input port also functioning as
IRQ7 interrupt input
When EXPE = 1, OEE = 0,
CS7E = 1, and DDR = 1, or
when OEE = 1, OES = 0, CS7E
= 1, and DDR = 1: Dual function
as IRQ7 interrupt input and CS7
output
When EXPE = 1, OEE = 1, and
OES = 1: Dual function as IRQ7
interrupt input and OE output
Mode
7