HD64F3437TF16 Datasheet, PDF (161/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

7.7.3 Pin Functions
Port 6 has the same pin functions in all operating modes. The pins are multiplexed with FRT
input/output, IRQ₆ and IRQ₇ input, and key-sense input. Table 7.13 indicates the pin functions of
port 6.
Table 7.13 Port 6 Pin Functions
Pin
P6₇/IRQ₇/
KEYIN₇
P6₆/FTOB/
IRQ₆/KEYIN₆
P6₅/FTID/
KEYIN₅
Pin Functions and Selection Method
P6₇DDR
0
1
Pin function
P6₇ input
P6₇ output
IRQ₇ input* or KEYIN₇ input
Note: * IRQ₇ input is usable when bit IRQ7E is set to 1 in IER
Bit OEB in TOCR of the FRT and bit P6₆DDR select the pin function as follows
OEB
0
1
P6₆DDR
0
1
0
1
Pin function
P6₆ input
P6₆ output
FTOB output
IRQ₆ input* or KEYIN₆ input
Note: * IRQ₆ input is usable when bit IRQ6E is set to 1 in IER
P6₅DDR
Pin function
0
1
P6₅ input
P6₅ output
FTID input or KEYIN₅ input
P6₄/FTIC/
KEYIN₄
P6₄DDR
Pin function
0
1
P6₄ input
P6₄ output
FTIC input or KEYIN₄ input
132