AM8530 datasheet(187/194 Pages) AMD

187 / 194 page

SCC Application Notes

AMD

7–38

{

unsigned long int count;

count = 0;

while(count<35550)

{

count++;

}

/*THIS ROUTINE INITIALIZES THE 8530 FOR ASYN-

CHRONOUS TRANSMIT*/

asccinit()

{

unsigned char array[arraysiz], temp;

unsigned int i=0;

array[0]=0x09;

array[1]=0xC0;

/*hardware reset*/

array[2]=0x4;

array[3]=0x44;

/*X16 clock, 1 stop bits*/

array[4]=0x3;

array[5]=0xC0;

/*8 bits/char.*/

array[6]=0x5;

array[7]=0x60;

/*8 bits/char.*/

array[8]=0xB;

array[9]=0x56;

/*RxC=BR gen, TxC=BR, TRxCout=BR*/

array[10]=0xC;

array[11]=0x06;

/*set BR gen for 19.2 kBaud*/

array[12]=0xD;

array[13]=0x00;

array[14]=0xE;

array[15]=0x07;

/*set DTR/REQ, enable BR gen, PCLK = BR

source*/

array[16]=0x5;

array[17]=0x68;

/*Enable transmitter*/

/*BEGIN ASYNCHRONOUS ROUTINE*/

temp = inportb(aport);/*read from RR0 to set up state machine*/

while(i<arraysiz)

{

outportb)aport, array[i++]);

}

/*TRANSMIT FILE ASYNCHRONOUSLY AT 19.2 kBaud*/

atrans()

{

unsigned int temp, tmp, tx;

unsigned int i, count;

temp = 0;

num = num + 1;

for (i=0; i<num; i++) /*process the loop until all chars. are

transmitted*/

{

tx = 0;

while(tx==0)

{

temp = inportb(aport);

/*load RR0

to check Tx buffer empty bit*/

tx = temp & 0x04;

}

AM8530 Datasheet(PDF) 187 Page - Advanced Micro Devices

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