s908ab32ag0cfue Freescale Semiconductor, Inc, s908ab32ag0cfue Datasheet - Page 324

• Manufacturer Part Number: s908ab32ag0cfue
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
17.6.2 Data Direction Register D (DDRD)
Technical Data
324
NOTE:
Address:
Data direction register D 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.
DDRD[7:0] — 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.
the port D I/O logic.
Reset:
Read:
Write:
These read/write bits control port D data direction. Reset clears
DDRD[7:0], configuring all port D pins as inputs.
1 = Corresponding port D pin configured as output
0 = Corresponding port D pin configured as input
DDRD7
READ DDRD ($0007)
WRITE DDRD ($0007)
WRITE PTD ($0003)
READ PTD ($0003)
$0007
Bit 7
Figure 17-12. Data Direction Register D (DDRD)
0
Input/Output (I/O) Ports
DDRD6
6
0
Figure 17-13. Port D I/O Circuit
RESET
DDRD5
5
0
DDRD4
DDRDx
PTDx
4
0
DDRD3
3
0
MC68HC908AB32
DDRD2
Freescale Semiconductor
Figure 17-13
2
0
PTDPUEx
PTD6 to TACLK of TIMA
PTD4 to TBCLK of TIMB
DDRD1
1
0
V
DD
—
shows
DDRD0
Rev. 1.1
Bit 0
0
PTDx