参数资料
型号: MC68HC05P9AMDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 135/158页
文件大小: 3885K
代理商: MC68HC05P9AMDW
Parallel I/O Ports
78
Parallel I/O Ports
When bit DDRDx is a logic 1, reading address $0003 reads the PDx data
latch. When bit DDRDx is a logic 0, reading address $0003 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit. Table 16 summarizes the operation
of the port D pins.
1. Hi-Z = high impedance
2. Writing affects data register, but does not affect input.
Table 18. Port D Pin Operation
Data Direction Bit
I/O Pin Mode
Accesses to Data Bit
Read
Write
0
Input, Hi-Z(1)
Pin
Latch(2)
1
Output
Latch
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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