參數(shù)資料
型號： MC38HC705J2
廠商： Motorola, Inc.
元件分類： DC/DC變換器
英文描述： RTS Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 3.3V; Power: 2W; Assembly; High Power Density; Optional Continuous Short Circuit Protected; Efficiency to 85%
中文描述： M68HC05系列系列8位微控制器單元
文件頁數(shù)： 18/78頁
文件大?。?/td> 427K
代理商： MC38HC705J2
MC68HC705J2
PARALLEL I/O
MOTOROLA
3-3
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. Figures 3-2 and 3-3 show
the port A data register and DDRA.
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
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.
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:
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
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