參數(shù)資料
型號: MC68HC705P9CDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 136/156頁
文件大?。?/td> 957K
代理商: MC68HC705P9CDWR2
Parallel I/O Ports
Port C
80
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 zero.
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 10 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 9. Data Direction Register C (DDRC)
10-mc68hc705p9
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