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

9.9.4

MOS Input Pull-Up Function

Port B 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 of PFCR, the LCD
driver LPCR, and DDR, setting PBPCR to 1 turns on MOS input pull-up.
In mode 7, if a pin is in the input state in accordance with the settings of the LCD driver LPCR
and DDR, setting PBPCR to 1 turns on MOS input pull-up.
The MOS input pull-up function is in the off state after a reset, and in hardware standby mode.
The prior state is retained by a manual reset or in software standby mode.
Table 9-18 summarizes the MOS input pull-up states.
Table 9-18 MOS Input Pull-Up States (Port B)
Pin States
Address output or
LCD output
Other than above
Legend:
OFF: MOS input pull-up is always off.
ON/OFF: On when PBDDR = 0 and PBPCR = 1; otherwise off.
Hardware
Reset Standby Mode
OFF OFF
Software In Other
Standby Mode Operations
OFF OFF
ON/OFF ON/OFF
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