Communication Processor Module
16-486
MPC823e REFERENCE MANUAL
MOTOROLA
PORTS
COMMUNICATION
16
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.
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.
PBDAT
BIT
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FIELD
RESERVED
RESET
0
R/W
R/W
ADDR
(IMMR & 0xFFFF0000) + 0x
AC4
BIT
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
FIELD
D16 D17 D18 D19 D20 D21 D22 D23 D24 D25 D26 D27 D28 D29 D30 D31
RESET
————————————————
R/W
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
ADDR
(IMMR & 0xFFFF0000) + 0xAC6
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