MC68HC908GR4 MOTOROLA [Motorola, Inc], MC68HC908GR4 Datasheet - Page 222

• Manufacturer Part Number: MC68HC908GR4
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Input/Output Ports (I/O)
16.6.2 Data Direction Register D
Technical Data
222
NOTE:
Address:
Data direction register D (DDRD) determines whether each port D pin is
an input or an output. Writing a logic 1 to a DDRD bit enables the output
buffer for the corresponding port D pin; a logic 0 disables the output
buffer.
DDRD6–DDRD0 — Data Direction Register D Bits
Avoid glitches on port D pins by writing to the port D data register before
changing data direction register D bits from 0 to 1.
Figure 16-15
Reset:
Read:
Write:
Freescale Semiconductor, Inc.
These read/write bits control port D data direction. Reset clears
DDRD6–DDRD0, configuring all port D pins as inputs.
For More Information On This Product,
1 = Corresponding port D pin configured as output
0 = Corresponding port D pin configured as input
$0007
Bit 7
Figure 16-14. Data Direction Register D (DDRD)
0
0
Go to: www.freescale.com
shows the port D I/O logic.
Input/Output Ports (I/O)
DDRD6
6
0
DDRD5
5
0
DDRD4
4
0
DDRD3
3
0
MC68HC908GR8 — Rev 4.0
DDRD2
2
0
DDRD1
1
0
MOTOROLA
DDRD0
Bit 0
0