AM8530 datasheet(190/194 Pages) AMD

190 / 194 page

SCC Application Notes

AMD

7–41

var_nam = scanf(“%s”, string1);

result = strcmp(string1,”N”);

res = strcmp(string1,”n”);

}

while(result!=0 && res!=0);

}

/*THIS ROUTINE SETS A VALUE FOR THE STARTING ADDRESS AND ALLO-

CATES

SPACE IN MEMORY TO ACCOMMODATE ENTIRE LENGTH OF FILE*/

opnfile()

{

extern char *alloc( );

unsigned int i;

ptr = alloc(num);

for(i=0; i<num; i++) *(ptr+i)=’\0’;

ptr—;

num = num + 1;

adrr = 01;

segread(&rv);

data_segment = rv.sds;

data_seg = data_segment << 4;

adrr = data_seg + (long int) ptr;

}

/*THIS ROUTINE INITIALIZES THE 8530 FOR RECEIVE*/

sccinit()

{

unsigned char array[arraysize];

/*array to initialize SCC reg-

isters*/

unsigned int i=0;

unsigned char temp;

/*temporary storage for

transmit/receive characters*/

array[0]=0x9;

array[1]=0xC0;

/*hardware reset the 8530*/

array[2]=0x4;

array[3]=0x20;

/*x1 clock, SDLC mode, parity disable*/

array[4]=0x1;

array[5]=0x40;

/*choose DMA request on receive*/

array[6]=0x3;

array[7]=0xFC;

/*Rx 8 bits/char, autoenabled, hunt mode,

receive crc enable*/

array[8]=0x5;

array[9]=0x63;

/*Tx 8 bits/char, RTS enabled, TxCRC

enabled*/

array[10]=0x6;

array[11]=0x02;

/*address for this device is 01*/

array[12]=0x7;

array[13]=0x7E;

/*SDLC flag pattern 01111110*/

array[14]=0x9;

array[15]=0x02;

/*No vector is returned*/

array[16]=0xA;

array[17]=0x00;

/*Send CRC and Flag on underrun, do not

abort*/

array[18]=0xB;

array[19]=0x08;

/*rec. clock=RTxC pin, Transmit clk=TRxC

pin*/

array[20]=0xE;

array[21]=0x00;

array[22]=0x3;

AM8530 Datasheet(PDF) 190 Page - Advanced Micro Devices

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