Hitachi H8S/2678 Series Reference Manual page 270

5.10.4 MOS Input Pull-Up Function
Port A has a built-in MOS input pull-up function that can be controlled by software. This MOS
input pull-up function can be used by pins PA7 to PA5 in modes 1, 2, 5, and 6, and by all pins in
modes 4 and 7. MOS input pull-up can be specified as on or off on a bit-by-bit basis.
When a PADDR bit is cleared to 0, setting the corresponding PAPCR bit to 1 turns on the MOS
input pull-up for that pin.
The MOS input pull-up function is in the off state after a reset and in hardware standby mode. The
prior state is retained in software standby mode.
Table 5.19 summarizes the MOS input pull-up states.
Table 5.19 MOS Input Pull-Up States (Port A)
Mode
4, 7 PA7 to PA0
1, 2, 5, 6 PA7 to PA5
PA4 to PA0
Legend:
Off: MOS input pull-up is always off.
On/Off: On when PADDR = 0 and PAPCR = 1; otherwise off.
Hardware
Reset Standby Mode
Off Off
Software In Other
Standby Mode Operations
On/Off On/Off
On/Off On/Off
Off Off
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