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MC68HSC705C8ACFS Datasheet(PDF) 79 Page - Freescale Semiconductor, Inc

Part # MC68HSC705C8ACFS
Description  M68HC05 Microcontrollers
PDF  222 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HSC705C8ACFS Datasheet(HTML) 79 Page - Freescale Semiconductor, Inc

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Parallel Input/Output (I/O)
Port A
MC68HC705C8A — Rev. 3
Technical Data
MOTOROLA
Parallel Input/Output (I/O)
7.3.2 Data Direction Register A
The contents of data direction register A (DDRA) shown in Figure 7-2
determine 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 associated port A
pin; a logic 0 disables the output buffer. A reset clears all DDRA bits,
configuring all port A pins as inputs.
DDRA7–DDRA0 — Port A Data Direction Bits
These read/write bits control port A data direction. Reset clears bits
DDRA7–DDRA0.
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 DDRA bits from logic 0 to logic 1.
Address:
$0004
Bit 7
6
54321
Bit 0
Read:
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Write:
Reset:
00
000000
Figure 7-2. Data Direction Register A (DDRA)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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