RAM测试时有点类似下面的程序(当然你可以修改它来使这个测试更全面些)——这里测试的RAM的数量是特定于PIC16C76的,如果要用于其它单片机型号,你需要查阅数据手册来确定相应型号的存储器范围。
#include
volatile unsigned char INDF @ 0x0; // not defined in pic.h
main()
{
IRP = 0; /* select bank 0/1 */
FSR = 0x20; /* check bank 0 */
do {
INDF = 0x55;
} while(++FSR != 0x80);
FSR = 0x20;
do {
if(INDF != 0x55)
for(;;);
} while(++FSR != 0x80);
FSR = 0xA0; // check bank 1
do {
INDF = 0x55;
} while(++FSR != 0xF0); // avoid the common area, already checked
FSR = 0xA0;
do {
if(INDF != 0x55)
for(;;);
} while(++FSR != 0xF0);
IRP = 1; /* select bank 2/3 */
FSR = 0x10; /* bank 2 RAM starts at 110 */
do {
INDF = 0x55;
} while(++FSR != 0x70); // last address is 170 (common is 170-17F)
FSR = 0x10;
do {
if(INDF != 0x55)
for(;;);
} while(++FSR != 0x70);
FSR = 0x90; // bank 3 RAM, 190-1EF
do {
INDF = 0x55;
} while(++FSR != 0xF0);
FSR = 0x90;
do {
if(INDF != 0x55)
for(;;);
} while(++FSR != 0xF0);
}
ROM的校验和就要看情况而定了。并不是所有的PIC单片机都能够读它自己的程序存储器的。部分Flash的型号是可以读的,但是PIC16C76是不能够读的,请查看相应单片机的数据手册来确定。
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