H8S-2633 Datasheet, PDF (557/1487 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer

Section 10B I/O Ports (H8S/2695)
10B.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 10B.13 summarizes the MOS input pull-up states.
Table 10B.13 MOS Input Pull-Up States (Port B)
Pin States
Power-On Hardware
Manual
Reset
Standby Mode Reset
Address output or
TPU output
OFF
OFF
OFF
Other than above
ON/OFF
Legend:
OFF: MOS input pull-up is always off.
ON/OFF: On when PBDDR = 0 and PBPCR = 1; otherwise off.
Software
Standby Mode
OFF
ON/OFF
In Other
Operations
OFF
ON/OFF
Rev. 5.00 Mar 28, 2005 page 495 of 1422
REJ09B0234-0500