Table 7.1 (b) Port Functions for H8/3397 Series
Expanded
Modes
Single-Chip
Mode
Mode 3
Port
Description
Pins
Mode 1
Mode 2
Master Mode
Port 1
• 8-bit I/O port
• Can drive LEDs
P17 to P10/A7 to A0
Lower address
output (A7 to A0)
Lower address
output (A7 to A0)
or general input
General
input/output
(Can also be
used as Key-
scan output
port)
• Built-in input pull-
ups
Port 2
• 8-bit I/O port
P27 to P20/A15 to A8
Upper address
output (A15 to A8)
Upper address
output (A15 to A8)
or general input
General
input/output
(Can also be
used as Key-
scan output
port)
• Can drive LEDs
• Built-in input
pull-ups
Port 3
Port 4
• 8-bit I/O port
P37 to P30/D7 to D0
Data bus
(D7 to D0)
Data bus
(D7 to D0)
General
input/output
• Built-in input
pull-ups
• 8-bit I/O port
P47/PW1
PWM timer 0/1 output (PW0, PW1), or general
input/output
P46/PW0
P45/TMRI1
8-bit timer 1 input/output (TMCI1, TMO1, TMRI1), or
general input/output
P44/TMO1
P43/TMCI1
P42/TMRI0
8-bit timer 0 input/output (TMCI0, TMO0, TMRI0) or
general input/output
P41/TMO0
P40/TMCI0
Port 5
Port 6
• 3-bit I/O port
• 8-bit I/O port
P52/SCK0
Serial communication interface 0 input/output (TxD0,
RxD0, SCK0) or general input/output
P51/RxD0
P50/TxD0
P67/IRQ7/KEYIN7
P66/FTOB/IRQ6/KEYIN6
P65/FTID/KEYIN5
P64/FTIC/KEYIN4
P63/FTIB/KEYIN3
P62/FTIA/KEYIN2
P61/FTOA/KEYIN1
P60/FTCI/KEYIN0
P77 to P70/AN7 to AN0
16-bit free-running timer input/output (FTCI, FTOA,
FTIA, FTIB, FTIC, FTID, FTOB), key sense interrupt
input (KEYIN7 to KEYIN0), external interrupt input (IRQ7,
IRQ6), or general input/output
• Built-in input
pull-ups
Port 7
• 8-bit input port
A/D converter analog input (AN7 to AN0) or general
input
110
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