SH7108 Datasheet, PDF (450/560 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 14 Pin Function Controller (PFC)
14.1.3 Port B I/O Register (PBIOR)
PBIOR is a 16-bit readable/writable register that sets the pins on port B as inputs or outputs. Bits
PB5IOR to PB0IOR correspond to pins PB5 to PB0 (names of multiplexed pins are here given as
port names and pin numbers alone). PBIOR is enabled when port B pins are functioning as
general-purpose inputs/outputs (PB5 to PB0). In other states, PBIOR is disabled.
A given pin on port B will be an output pin if the corresponding bit in PBIOR is set to 1, and an
input pin if the bit is cleared to 0.
Note that bits 1 and 0 are disabled in the SH7108.
Bits 15 to 6 are reserved. These bits are always read as 0. The write value should always be 0.
The initial vale of PBIOR is H'0000.
Rev.1.00 Sep. 18, 2008 Page 416 of 522
REJ09B0069-0100