These routines transmit and receive serial data using two general
* I/O pins, in 8 bit, No parity, 1 stop bit format. They are useful
* for performing serial I/O on 8051 derivatives not having an
* internal UART, or for implementing a second serial channel.
Philips ARM LPC2100 的I/O口程序，別小看這段通用接口程序，這里面包含了完整的啟動(dòng)代碼，而且是匯編和C對(duì)照的，希望對(duì)硬件編程的朋友有幫助，因?yàn)楫?dāng)時(shí)我就位了啟動(dòng)代碼學(xué)習(xí)了好一陣子，才算學(xué)會(huì)。
