MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 321
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MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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17.5.2 Data Direction Register C (DDRC)
MC68HC908AB32
MOTOROLA
NOTE:
—
Rev. 1.0
Address:
PTC[5:0] — Port C Data Bits
MCLK — T12 System Clock
Data direction register C determines whether each port C pin is an input
or an output. Writing a logic 1 to a DDRC bit enables the output buffer
for the corresponding port C pin; a logic 0 disables the output buffer.
MCLKEN — T12 System Clock Enable Bit
DDRC[5:0] — Data Direction Register C Bits
Avoid glitches on port C pins by writing to the port C data register before
changing data direction register C bits from 0 to 1.
the port C I/O logic.
Reset:
Read:
Write:
These read/write bits are software programmable. Data direction of
each port C pin is under the control of the corresponding bit in data
direction register C. Reset has no effect on port C data.
The system clock is driven out of the PTC2 pin when MCLKEN is set.
This read/write bit enables MCLK to be an output signal on PTC2 pin.
Reset clears MCLKEN.
These read/write bits control port C data direction. Reset clears
DDRC[5:0], configuring all port C pins as inputs.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = PTC2 pin configured as MCLK output
0 = PTC2 pin configured as standard I/O pin
1 = Corresponding port C pin configured as output
0 = Corresponding port C pin configured as input
MCLKEN
$0006
Bit 7
0
Figure 17-9. Data Direction Register B (DDRB)
Go to: www.freescale.com
Input/Output (I/O) Ports
6
0
0
DDRC5
5
0
DDRC4
4
0
DDRC3
3
0
DDRC2
Figure 17-10
2
0
Input/Output (I/O) Ports
DDRC1
1
0
Technical Data
shows
DDRC0
Bit 0
Port C
0
321
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