pic18 SPI程序

PIC18F452的SPI接口存储器测试程序，USART输出-PIC18F452 SPI interface memory test program, USART output

SPI通信---pic18系列单片机编程实现使用MAX7219控制4位7段数码管显示数字：0 1 2 3。-SPI communication--- pic18 series microcontroller programming using the MAX7219 control four 7-segment LED display digits: 0123.