The Port B Registers - Motorola MPC823e Reference Manual

SIGNAL
PBPAR = 0
PB17 PORT B17
PB16 PORT B16

16.14.6 The Port B Registers

Port B has four memory-mapped, read-write control registers.
16.14.6.1 PORT B OPEN-DRAIN REGISTER. The 16-bit port B open drain register
(PBODR) indicates when the port pins are configured in a a normal or wired-OR
configuration. Bits 0 and 15 of this register are reserved.
PBODR
BIT 0 1 2
FIELD
RESET
R/W
ADDR
BIT 16 17 18
FIELD OD16 OD17 OD18 OD19 OD20 OD21 OD22 OD23 OD24 OD25 OD26 OD27 OD28 OD29 OD30 OD31
RESET
0 0 0
R/W
R/W R/W R/W
ADDR
Bits 0–15—Reserved
These bits are reserved and must be set to 0.
OD16–OD31—Open-Drain Pins 16-31
0 = The I/O pin is actively driven as an output.
1 = The I/O pin is an open-drain driver. As an output, the pin is actively driven low.
Otherwise, it is three-stated.
Note: SMTXD1 cannot be set as an open-drain driver, regardless of how this register
is set.
MOTOROLA
Table 16-42. Port B Pin Assignment
PIN FUNCTION
PBPAR = 1
PBDIR = 0 PBDIR = 1
L1ST3 LCD_C
L1ST4 L1RQA
3 4 5 6 7
RESERVED
0
R/W
(IMMR & 0xFFFF0000) + 0x
19 20 21 22 23
0 0 0 0 0
R/W R/W R/W R/W R/W
(IMMR & 0xFFFF0000) + 0x
MPC823e REFERENCE MANUAL
Communication Processor Module
INPUT TO ON-CHIP
PERIPHERALS
—
—
8 9 10 11 12
AC0
24 25 26 27 28
0 0 0 0 0
R/W R/W R/W R/W R/W
AC2
13 14 15
29 30 31
0 0 0
R/W R/W R/W
16-485