Mos Input Pull-Up Function - Hitachi H8S/2646 Hardware Manual

9.8.4

MOS Input Pull-Up Function

Port A has a built-in MOS input pull-up function that can be controlled by software. MOS input
pull-up can be specified as on or off on an individual bit basis.
In modes 4 to 6, if a pin is in the input state in accordance with the settings in PFCR, in LPCR,
and in DDR, setting the corresponding PAPCR bit to 1 turns on the MOS input pull-up for that
pin.
In mode 7, if a pin is in the input state in accordance with the settings in the LPCR and in DDR,
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 9-15 summarizes the MOS input pull-up states.
Table 9-15 MOS Input Pull-Up States (Port A)
Pin States
Address output or
SCI output
Other than above
Legend:
OFF : MOS input pull-up is always off.
ON/OFF : On when PADDR = 0 and PAPCR = 1; otherwise off.
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Hardware
Reset Standby Mode
OFF OFF
Software In Other
Standby Mode Operations
OFF OFF
ON/OFF ON/OFF