Motorola MPC823e Reference Manual page 940

Communication Processor Module
16.14.6.2 PORT B DATA REGISTER. A read of the port B data register (PBDAT) returns
the data to the pin, regardless of whether the pin is defined as an input or output. This allows
output conflicts to be found on the pin by comparing the written data with the data on the pin.
A write to the PBDAT is latched and if that bit in the PBDIR is configured as an output, the
value latched for that bit is driven onto its respective pin. PBDAT can be read or written at
any time, is not initialized, and is undefined at reset.
PBDAT
BIT 0 1 2
FIELD
RESET
R/W
ADDR
BIT 16 17 18
FIELD D16 D17 D18
RESET — — —
R/W R/W R/W R/W
ADDR
Bits 0–15—Reserved
These bits are reserved and must be set to 0.
D16–31—Data Pins 16–31
These bits contain data can be read or written from the port B pins.
16-486
3 4 5 6 7
RESERVED
0
R/W
(IMMR & 0xFFFF0000) + 0x
19 20 21 22 23
D19 D20 D21 D22 D23
— — — — —
R/W R/W R/W R/W R/W
(IMMR & 0xFFFF0000) + 0xAC6
MPC823e REFERENCE MANUAL
8 9 10 11 12
AC4
24 25 26 27 28
D24 D25 D26 D27 D28
— — — — —
R/W R/W R/W R/W R/W
13 14 15
29 30 31
D29 D30 D31
— — —
R/W R/W R/W
MOTOROLA