51 KEIL环境下汇编调用C函数，实现TIMER0软件清狗，TIMER1定时控制SSR，TIMER2用作串口波特率，汇编调用C函数超级代码和编译环境-51 KEIL environment, called C function assembly to achieve dogs TIMER0 software clear, TIMER1 timing control SSR, TIMER2 for serial baud rate, super-assembly function call C