參數(shù)資料
型號(hào): MC68HC05P18ADWE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 88/130頁
文件大?。?/td> 1310K
代理商: MC68HC05P18ADWE
NON-DISCLOSURE
AGREEMENT
REQUIRED
Input/Output (I/O) Ports
Technical Data
MC68HC05P18A
Input/Output (I/O) Ports
7.7 I/O Port Programming
Each pin on ports A through port D, with the exception of pin 7 of port D,
may be programmed as an input or an output under software control as
The direction of a pin is determined by the state of its corresponding bit
in the associated port data direction register (DDR). A pin is configured
as an output if its corresponding DDR bit is set to a logic 1. A pin is
configured as an input if its corresponding DDR bit is cleared to a logic 0.
Table 7-1. Port A I/O Pin Functions
DDRA
I/O Pin Mode
Access
to DDRA @ $0004
Access
to Data Register @ $0000
Read/Write
Read
Write
0
In, Hi-Z
DDRA0–DDRA7
I/O pin
See note
1
Out
DDRA0–DDRA7
PA0–PA7
Note: Does not affect input, but stored to data register
Table 7-2. Port B I/O Pin Functions
DDRB
I/O Pin Mode
Access
to DDRB @ $0005
Access
to Data Register @ $0001
Read/Write
Read
Write
0
In, Hi-Z
DDRB5–DDRB7
I/O pin
See note
1
Out
DDRB5–DDRB7
PB5–PB7
Note: Does not affect input, but stored to data register
Table 7-3. Port C I/O Pin Functions
DDRC
I/O Pin Mode
Access
to DDRC @ $0006
Access
to Data Register @ $0002
Read/Write
Read
Write
0
In, Hi-Z
DDRC0–DDRC7
I/O pin
See note
1
Out
DDRC0–DDRC7
PC0–PC7
Note: Does not affect input, but stored to data register
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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