HD64F3437TF16 Datasheet, PDF (178/752 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.

Pin
PA₂/KEYIN₁₀
PA₁/KEYIN₉
PA₀/KEYIN₈
Pin Functions and Selection Method
PA₂DDR
Pin function
0
PA₂ input
KEYIN₁₀ input
1
PA₂ output
PA₁DDR
Pin function
0
PA₁ input
KEYIN₉ input
1
PA₁ output
PA₀DDR
Pin function
0
PA₀ input
KEYIN₈ input
1
PA₀ output
7.11.4 Input Pull-Up Transistors
Port A has built-in programmable input pull-up transistors that are available in all modes.
An input pull-up transistor is turned on if 1 is written in the corresponding PAODR bit while the
corresponding PADDR bit is cleared to 0. The input pull-ups are turned off by a reset and in
hardware standby mode.
Table 7.22 indicates the states of the input pull-up transistors in each operating mode.
Table 7.22 States of Input Pull-Up Transistors (Port A)
Mode Reset Hardware Standby Software Standby Other Operating Modes
1
Off
Off
On/off
On/off
2
Off
Off
On/off
On/off
3
Off
Off
On/off
On/off
Notes: Off: The input pull-up transistor is always off.
On/off: The input pull-up transistor is on if PAODR = 1 and PADDR = 0, but off otherwise.
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