智能车笔记8 普通IO口

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本文介绍了单片机中PORTA和PORTB两个通用输入输出端口的使用方法，包括数据寄存器和数据方向寄存器的作用及配置流程。

可用的普通IO口有

PORTA 8个，PORTB 8个

1.Port A Data Register (PORTA)

域	描述
7-0	Port A general purpose input/output data—Data Register
	The associated pin can be used as general purpose I/O. In general purpose output mode the register bit value is
	driven to the pin.
	If the associated data direction bit is set to 1, a read returns the value of the port register bit, otherwise the buffered
	pin input state is read.

2.Port A Data Direction Register (DDRA)

域	描述
7-0	Port A Data Direction—
	This bit determines whether the associated pin is an input or output.
	1 Associated pin configured as output
	0 Associated pin configured as input

PORTB 用法与PORTA用法一样