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M68ICS08GR Datasheet(PDF) 210 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) 210 Page - Freescale Semiconductor, Inc

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Input/Output Ports (I/O)
Technical Data
MC68HC908GR8 — Rev 4.0
210
Input/Output Ports (I/O)
MOTOROLA
16.3.2 Data Direction Register A
Data direction register A (DDRA) determines whether each port A pin is
an input or an output. Writing a logic 1 to a DDRA bit enables the output
buffer for the corresponding port A pin; a logic 0 disables the output
buffer.
DDRA3–DDRA0 — Data Direction Register A Bits
These read/write bits control port A data direction. Reset clears
DDRA3–DDRA0, configuring all port A pins as inputs.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
NOTE:
Avoid glitches on port A pins by writing to the port A data register before
changing data direction register A bits from 0 to 1.
Figure 16-4 shows the port A I/O logic.
Address:
$0004
Bit 7
654321
Bit 0
Read:
0000
DDRA3
DDRA2
DDRA1
DDRA0
Write:
Reset:
00000000
Figure 16-3. Data Direction Register A (DDRA)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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