Data Direction Registers; Table 32-5 Data Direction Registers Description - Motorola DragonBall MC9328MX1 Reference Manual

32.5.1 Data Direction Registers

The data direction registers specify whether each pin of the port is an input or an output pin.
There are four distinct Data Direction Registers; each holds the data for one of the four GPIO ports (Port
A, Port B, Port C, and Port D).
DDIR_A
DDIR_B
DDIR_C
DDIR_D
BIT 31 30 29
TYPE rw rw rw
0 0 0
RESET
BIT 15 14 13
TYPE rw rw rw
0 0 0
RESET
Name
DDIR [i] Data Direction—Controls the direction of the pins.
Bits 31–0
MOTOROLA
Port A Data Direction Register
Port B Data Direction Register
Port C Data Direction Register
Port D Data Direction Register
28 27 26 25
rw rw rw rw
0 0 0 0
12 11 10 9
rw rw rw rw
0 0 0 0
Table 32-5. Data Direction Registers Description
Description
GPIO Module and I/O Multiplexer (IOMUX)
24 23 22 21
DDIR
rw rw rw rw
0 0 0 0
0x0000
8 7 6 5
DDIR
rw rw rw rw
0 0 0 0
0x0000
0 = Pin [i] is an input
1 = Pin [i] is an output
Programming Model
Addr
0x0021C000
0x0021C100
0x0021C200
0x0021C300
20 19 18 17
rw rw rw rw
0 0 0 0
4 3 2 1
rw rw rw rw
0 0 0 0
Settings
32-9
16
rw
0
0
rw
0