HD64F3437TF16 Datasheet, PDF (177/752 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.

7.11.3 Pin Functions in Each Mode
Port A has the same pin functions in all operating modes. Table 7.21 indicates the pin functions of
port A.
Table 7.21 Port A Pin Functions
Pin
PA₇/KEYIN₁₅
PA₆/KEYIN₁₄
PA₅/KEYIN₁₃
PA₄/KEYIN₁₂
PA₃/KEYIN₁₁
Pin Functions and Selection Method
PA₇DDR
0
1
Pin function
PA₇ input
PA₇ output
KEYIN₁₅ input
This pin is driven as a bus buffer when bit IICS is set to 1 in STCR
PA₆DDR
0
1
Pin function
PA₆ input
PA₆ output
KEYIN₁₄ input
This pin is driven as a bus buffer when bit IICS is set to 1 in STCR
PA₅DDR
0
1
Pin function
PA₅ input
PA₅ output
KEYIN₁₃ input
This pin is driven as a bus buffer when bit IICS is set to 1 in STCR
PA₄DDR
0
1
Pin function
PA₄ input
PA₄ output
KEYIN₁₂ input
This pin is driven as a bus buffer when bit IICS is set to 1 in STCR
PA₃DDR
Pin function
0
PA₃ input
KEYIN₁₁ input
1
PA₃ output
148