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MC68HC705P9CS 데이터시트(PDF) 92 Page - Freescale Semiconductor, Inc

부품명 MC68HC705P9CS
상세설명  Microcontrollers
PDF  160 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705P9CS 데이터시트(HTML) 92 Page - Freescale Semiconductor, Inc

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Parallel Input/Output (I/O) Ports
Technical Data
MC68HC705P9 — Rev. 4.0
92
Parallel Input/Output (I/O) Ports
MOTOROLA
7.6.2 Data Direction Register D (DDRD)
Data direction register D determines whether each port D pin is an input
or an output.
DDRD5 — Data Direction Register D Bit
This read/write bit controls the data direction of pin PD5. Reset clears
DDRD5, configuring PD5 as an input.
1 = PD5 configured as output
0 = PD5 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 7-13 shows the I/O logic of port D.
Figure 7-13. Port D I/O Logic
$0007
Bit 7
6
54321
Bit 0
Read:
0
0
DDRD5
00000
Write:
Reset:
00
000000
= Unimplemented
Figure 7-12. Data Direction Register D (DDRD)
READ DATA DIRECTION REGISTER D ($0007)
WRITE DATA DIRECTION REGISTER D ($0007)
RESET
WRITE PORT D DATA REGISTER ($0003)
READ PORT D DATA REGISTER ($0003)
PDx
PDx
DDRDx
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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