HD6432646 Hitachi, HD6432646 Datasheet - Page 299

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

9.9.4
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.
MOS Input Pull-Up Function
Reset
OFF
Hardware
Standby Mode
OFF
Software
Standby Mode
OFF
ON/OFF
In Other
Operations
OFF
ON/OFF
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