參數(shù)資料
型號: MC68HC05J1ADW
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 62/128頁
文件大?。?/td> 1620K
代理商: MC68HC05J1ADW
Technical Data
MC68HC05J1A — Rev. 3.0
62
Parallel Input/Output (I/O)
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Parallel Input/Output (I/O)
7.4 Port A
Port A is an 8-bit, general-purpose, bidirectional I/O port with these
features:
Programmable pulldown devices (mask option)
8-mA current sinking capability (pins PA7–PA4)
External interrupt capability (mask option: pins PA3–PA0)
7.4.1 Port A Data Register
The port A data register (PORTA) contains a bit for each of the port A
pins. When a port A pin is programmed to be an output, the state of its
data register bit determines the state of the output pin. When a port A pin
is programmed to be an input, reading the port A data register returns
the logic state of the pin.
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 bit in data direction
register A. Resets have no effect on port A data.
Address:
$0000
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Write:
Reset:
Unaffected by reset
Figure 7-1. Port A Data Register (PORTA)
F
Freescale Semiconductor, Inc.
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.
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