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10.8.4
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 in PFCR, in the TPU's
TIOR, and in DDR, setting the corresponding PBPCR 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 TPU's TIOR and in
DDR, setting the corresponding PBPCR 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 power-on reset, and in hardware standby
mode. The prior state is retained by a manual reset or in software standby mode.
Table 10-13 summarizes the MOS input pull-up states.
Table 10-13 MOS Input Pull-Up States (Port B)
Pin States
Address output or
TPU output
Other than above
Legend:
OFF
: MOS input pull-up is always off.
ON/OFF : On when PBDDR = 0 and PBPCR = 1; otherwise off.
374
Power-On
Hardware
Reset
Standby Mode
OFF
OFF
Manual
Software
Reset
Standby Mode
OFF
OFF
ON/OFF
ON/OFF
In Other
Operations
OFF
ON/OFF
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