mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 388
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mc68hc908lj24
Manufacturer Part Number
mc68hc908lj24
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908LJ24.pdf
(464 pages)
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Input/Output (I/O) Ports
18.5.2 Data Direction Register C (DDRC)
Data Sheet
388
NOTE:
Address:
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.
DDRC[7:0] — 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 control port C data direction. Reset clears
DDRC[7:0], configuring all port C pins as inputs.
1 = Corresponding port C pin configured as output
0 = Corresponding port C pin configured as input
DDRC7
READ DDRC ($0006)
WRITE DDRC ($0006)
WRITE PTC ($0002)
READ PTC ($0002)
$0006
Bit 7
Figure 18-10. Data Direction Register C (DDRC)
0
Input/Output (I/O) Ports
DDRC6
6
0
Figure 18-11. Port C I/O Circuit
RESET
DDRC5
5
0
DDRC4
DDRCx
PTCx
4
0
DDRC3
MC68HC908LJ24/LK24 — Rev. 2.1
3
0
DDRC2
Freescale Semiconductor
Figure 18-11
2
0
DDRC1
1
0
shows
DDRC0
Bit 0
0
PTCx
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