参数资料
型号: MC68HC05P9ACDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 131/158页
文件大小: 3885K
代理商: MC68HC05P9ACDW
Parallel I/O Ports
74
Parallel I/O Ports
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
654321
Bit 0
Read:
DDRC7
DDRC6
DDRC5
DDRC4
DDRC3
DDRC2
DDRC1
DDRC0
Write:
Reset:
00000000
Figure 36. Data Direction Register C (DDRC)
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