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M68ICS08GR Datasheet(PDF) 222 Page - Freescale Semiconductor, Inc

Part # M68ICS08GR
Description  M68HC08 Microcontrollers
PDF  408 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68ICS08GR Datasheet(HTML) 222 Page - Freescale Semiconductor, Inc

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Input/Output Ports (I/O)
Technical Data
MC68HC908GR8 — Rev 4.0
222
Input/Output Ports (I/O)
MOTOROLA
16.6.2 Data Direction Register D
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
These read/write bits control port D data direction. Reset clears
DDRD6–DDRD0, configuring all port D pins as inputs.
1 = Corresponding port D pin configured as output
0 = Corresponding port D pin configured as input
NOTE:
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 shows the port D I/O logic.
Address:
$0007
Bit 7
654321
Bit 0
Read:
0
DDRD6
DDRD5
DDRD4
DDRD3
DDRD2
DDRD1
DDRD0
Write:
Reset:
00000000
Figure 16-14. Data Direction Register D (DDRD)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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