HD6432621 Hitachi, HD6432621 Datasheet - Page 296

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

9.6.4
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 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 reset, and in hardware standby mode.
The prior state is retained in software standby mode.
Table 9-11 summarizes the MOS input pull-up states.
Table 9-11 MOS Input Pull-Up States (Port B)
Pin States
Address output or
TPU output
Other than above
Legend:
OFF
ON/OFF : On when PBDDR = 0 and PBPCR = 1; otherwise off.
252
MOS Input Pull-Up Function
: MOS input pull-up is always off.
Power-On
Reset
OFF
Hardware
Standby Mode
OFF
Software
Standby Mode
OFF
ON/OFF
In Other
Operations
OFF
ON/OFF