參數(shù)資料
型號： MC68HC05P18MDW
廠商： MOTOROLA 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)： 110/144頁
文件大?。?/td> 1348K
代理商： MC68HC05P18MDW
Advance Information
MC68HC(8)05P18 — Rev. 2.0
68
Input/Output (I/O) Ports
MOTOROLA
Input/Output (I/O) Ports
7.7 I/O Port Programming
Each pin on port A through port D (except pin 7 of port D) may be
programmed as an input or an output under software control as shown
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 Functions
DDRA
I/O Pin Mode
Access to DDRA
@ $0004
Access to Data
Register @ $0000
Read/Write
Read
Write
0
Input, high impedance
DDRA0–DDRA7
I/O pin
*
1
Output
DDRA0–DDRA157
PA0–PA7
*Does not affect input, but stored to data register
Table 7-2. Port B I/O Functions
DDRB
I/O Pin Mode
Access to DDRA
@ $0005
Access to Data
Register @ $0001
Read/Write
Read
Write
0
Input, high impedance
DDRB5–DDRB7
I/O pin
*
1
Output
DDRB5–DDRB7
PB5–PB7
*Does not affect input, but stored to data register
Table 7-3. Port C I/O Functions
DDRA
I/O Pin Mode
Access to DDRA
@ $0006
Accesses to Data
Register @ $0002
Read/Write
Read
Write
0
Input, high impedance
DDRC0–DDRC7
I/O pin
*
1
Output
DDRC0–DDRC7
PC0–PC7
*Does not affect input, but stored to data register
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