108
Table 7.1 (a) Port Functions for H8/3337 Series
Expanded
Modes
Single-Chip
Mode
Port
Description
Pins
Mode 1
Mode 2
Mode 3
Port 1
8-bit I/O port
Can drive LEDs
Built-in input
pull-ups
P1
7 to P10/A7 to A0
Lower address
output (A
7 to A0)
Lower address
output (A
7 to A0)
or general input
General
input/output
(Can also be
used as Key-
scan output
port)
Port 2
8-bit I/O port
Can drive LEDs
Built-in input
pull-ups
P2
7 to P20/A15 to A8
Upper address
output (A
15 to A8)
Upper address
output (A
15 to A8)
or general input
General
input/output
(Can also be
used as Key-
scan output
port)
Port 3
8-bit I/O port
Built-in input
pull-ups
HIF data bus
P3
7 to P30/
HDB
7 to HDB0/
D
7 to D0
Data bus
(D
7 to D0)
Data bus
(D
7 to D0)
HIF data bus
(HDB
7 to
HDB
0) or
general input/
output
Port 4
8-bit I/O port
P4
7/PW1
P4
6/PW0
PWM timer 0/1 output (PW
0, PW1), or general input/
output
P4
5/TMRI1/HIRQ12
P4
4/TMO1/HIRQ1
P4
3/TMCI1/HIRQ11
8-bit timer 1 input/output (TMCI
1, TMO1, TMRI1), host
processor interrupt request output from HIF (HIRQ
11,
HIRQ
1, HIRQ12), or general input/output
P4
2/TMRI0
P4
1/TMO0
P4
0/TMCI0
8-bit timer 0 input/output (TMCI
0, TMO0, TMRI0) or
general input/output
Port 5
3-bit I/O port
P5
2/SCK0
P5
1/RxD0
P5
0/TxD0
Serial communication interface 0 input/output (TxD
0,
RxD
0, SCK0) or general input/output
Port 6
8-bit I/O port
Built-in input
pull-ups
Key sense
interrupt input
P6
7/IRQ7/KEYIN7
P6
6/FTOB/IRQ6/KEYIN6
P6
5/FTID/KEYIN5
P6
4/FTIC/KEYIN4
P6
3/FTIB/KEYIN3
P6
2/FTIA/KEYIN2
P6
1/FTOA/KEYIN1
P6
0/FTCI/KEYIN0
16-bit free-running timer input/output (FTCI, FTOA,
FTIA, FTIB, FTIC, FTID, FTOB), key sense interrupt
input (
KEYIN
7 to KEYIN0), external interrupt input (IRQ7,
IRQ
6), or general input/output