參數(shù)資料
型號(hào): MC68HC705J2S
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS MICROCONTROLLER UNIT
中文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER, CDIP20
封裝: WINDOWED, CERDIP-20
文件頁(yè)數(shù): 21/82頁(yè)
文件大?。?/td> 327K
代理商: MC68HC705J2S
MC68HC705J2
Rev. 2
PARALLEL I/O
MOTOROLA
3-3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
3.2 Port A
Port A is an 8-bit general-purpose bidirectional I/O port. The contents of DDRA
determine whether each pin is an input or an output.
Figure 3-2
and
Figure 3-3
show
the port A data register and DDRA.
Figure 3-2. Port A Data Register
PA7–PA0 — Port A Data Bits
These read/write bits are software-programmable. Data direction of each bit is
under the control of the corresponding DDRA bit.
Figure 3-3. Port A Data Direction Register
DDRA7–DDRA0 — Port A Data Direction Bits
These read/write bits control port A data direction.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
PORTA
— Port A Data Register
$0000
Bit 7
PA7
6
5
4
3
2
1
Bit 0
PA0
PA6
PA5
PA4
PA3
PA2
PA1
RESET:
NOT CHANGED BY RESET
DDRA
— Port A Data Direction Register
$0004
Bit 7
0
0
6
0
0
5
4
3
2
1
Bit 0
DDRA0
0
DDRA5
0
DDRA4
0
DDRA3
0
DDRA2
0
DDRA1
0
RESET:
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