參數(shù)資料
型號: MC68HC705J2
廠商: Motorola, Inc.
英文描述: HCMOS MICROCONTROLLER UNIT
中文描述: HCMOS微控制器
文件頁數(shù): 22/82頁
文件大?。?/td> 327K
代理商: MC68HC705J2
MOTOROLA
3-4
PARALLEL I/O
MC68HC705J2
Rev. 2
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3.3 Port B
Port B is a 6-bit general-purpose bidirectional I/O port. The contents of DDRB
determine whether each pin is an input or an output.
Figure 3-4
and
Figure 3-5
show the port B data register and DDRB.
Figure 3-4. Port B Data Register
PB5–PB0 — Port B Data Bits
These read/write bits are software-programmable. Data direction of each bit is
under the control of the corresponding DDRA bit.
Figure 3-5. Port B Data Direction Register
DDRB7–DDRB0 — Port B Data Direction Bits
These read/write bits control port B data direction.
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured as input
PORTB
— Port B Data Register
$0001
Bit 7
0
6
0
5
4
3
2
1
Bit 0
PB0
PB5
PB4
PB3
PB2
PB1
RESET:
NOT CHANGED BY RESET
DDRB —
Port B Data Direction Register
$0005
Bit 7
DDRB7
0
6
5
4
3
2
1
Bit 0
DDRB0
0
DDRB6
0
DDRB5
0
DDRB4
0
DDRB3
0
DDRB2
0
DDRB1
0
RESET:
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