參數(shù)資料
型號: C05M68HC05M
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): 57/130頁
文件大小: 1541K
代理商: C05M68HC05M
Input/Output Ports
I/O Port Programming
MC68HC705P6A
Rev. 2.0
Advance Information
MOTOROLA
Input/Output Ports
57
NOTE:
To avoid generating a glitch on an I/O port pin, data should be written to
the I/O port data register before writing a logic 1 to the corresponding
data direction register.
At power-on or reset, all DDRs are cleared, which configures all port pins
as inputs. The DDRs are capable of being written to or read by the
processor. During the programmed output state, a read of the data
register will actually read the value of the output data latch and not the
level on the I/O port pin.
Table 6-4. Port D I/O Functions
DDRD
I/O Pin Mode
Accesses to
DDRD @ $0007
Accesses to Data
Register @ $0003
Read/Write
Read
Write
0
IN, Hi-Z
DDRD5
I/O Pin
See Note 1
1
OUT
DDRD5
PD5
PD5
Notes:
1. Does not affect input, but stored to data register
2. PD7 is input only
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