D12320VF25IV Datasheet, PDF (441/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
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. This MOS
input pull-up function can be used in modes 6 and 7, and can be specified as on or off on an
individual bit basis.
When a PBDDR bit is cleared to 0 in mode 6 or 7, 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 9.17 summarizes the MOS input pull-up states.
Table 9.17 MOS Input Pull-Up States (Port B)
Modes
Reset
Hardware
Standby Mode
Software
Standby Mode
4, 5
Off
Off
Off
6, 7
On/off
Legend:
Off: MOS input pull-up is always off.
On/off: On when PBDDR = 0 and PBPCR = 1; otherwise off.
In Other
Operations
Off
On/off
Rev.6.00 Sep. 27, 2007 Page 409 of 1268
REJ09B0220-0600