一天学会单片机.docVIP

一天入门单片机设计 你没有看错，是一天入门单片机设计。本文不求面面俱到，只希望从冗杂的各种教程里抽离出来，帮助各位电子爱好者快速掌握单片机入门的关键点。 设计一个单片机板子，首先要考虑几个问题：第一、板子要实现的功能；第二、需要用到的芯片；第三、程序的设计，当然你要设计成为产品进入市场，是否达到客户的需求。 既然，是入门级的教程，本教程要实现的功能很简单就是让LED灯每隔0.6秒闪烁1次，模拟信号的输出；选用廉价芯片Atmega8A；Atmega8A支持C语言编程，方便加快设计的速度。 第一步、了解芯片设计参数） VCC Digital supply voltage. Vcc 数字电源 GND Ground. GND 接地 Port B (PB7..PB0) XTAL1/XTAL2/TOSC1/ TOSC2 Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset condition becomes active, even if the clock is not running. Depending on the clock selection fuse settings, PB6 can be used as input to the inverting Oscil- lator amplifier and input to the internal clock operating circuit. Depending on the clock selection fuse settings, PB7 can be used as output from the inverting Oscillator amplifier. If the Internal Calibrated RC Oscillator is used as chip clock source, PB7..6 is used as TOSC2..1 input for the Asynchronous Timer/Counter2 if the AS2 bit in ASSR is set. 端口B (PB0~PB7)XTAL1/XTAL2/TOSC1/TOSC2 端口B口是一个8位双向I / O端口内部上拉电阻（每个位选中）。端口B输出缓冲器具有对称的驱动特性上拉电阻被激活端口B输入。 根据时钟选择的设置，PB6可作为振荡和时钟工作电路输入。 根据时钟选择的设置，PB7可作振荡电路输出端。 如果作为时，PB7?.. 6tosc2?..1）用于异步定时器/?2输入如果ASSR?AS2位设置。 Port C (PC5..PC0) Port C is an 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset condition becomes active, even if the clock is not running. 端口C（PC5?..?PC0） 端口C是内部上拉电阻一个双向I / O端口（每个位选中）。如果拉电阻端口C引脚被外部拉低。PC6/RESET If the RSTDISBL Fuse is programmed, PC