參數資料
型號: MC68HC05P9AP
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數: 74/158頁
文件大?。?/td> 1106K
代理商: MC68HC05P9AP
Parallel I/O Ports
74
Parallel I/O Ports
MOTOROLA
The port C data register reads normally while the ADC is on, except
that the bit corresponding to the currently selected ADC input pin
reads as logic 0.
Writing to bits PC7–PC3 while the ADC is on can produce
unpredictable ADC results.
Data Direction
Register C (DDRC)
Data direction register C determines whether each port C pin is an input
or an output.
DDRC[7:0] — Data Direction Register C Bits
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
NOTE:
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.
Writing to bits DDRC7–DDRC3 while the ADC is on can produce
unpredictable ADC results.
Figure 37
shows the I/O logic of port C.
$0006
Bit 7
6
5
4
3
2
1
Bit 0
Read:
DDRC7
DDRC6
DDRC5
DDRC4
DDRC3
DDRC2
DDRC1
DDRC0
Write:
Reset:
0
0
0
0
0
0
0
0
Figure 36. Data Direction Register C (DDRC)
14-mc68hc05p9a
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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