sfr IE2 = 0xaf;
#define ESPI 0x02
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xc9;
sfr P5M0 = 0xca;
sbit LED = P1^1;
void SPI_Isr() interrupt 9
{
SPSTAT = 0xc0; //Clear interrupt flag
}
void main()
{
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
SPCTL = 0x40; //Enable SPI slave mode
SPSTAT = 0xc0; //Clear interrupt flag
while (1)
{
while (!(SPSTAT & 0x80)); //Query completion flag
SPSTAT = 0xc0; //Clear interrupt flag
SPDAT = SPDAT; //Transmit the received data back to the master
LED = !LED; //Test port
}
}
Assembly code
;Operating frequency for test is 11.0592MHz
SPSTAT DATA 0CDH
SPCTL DATA 0CEH
SPDAT DATA 0CFH
IE2 DATA 0AFH
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