AM8530 datasheet(168/194 Pages) AMD

168 / 194 page

SCC Application Notes

7-19

AMD

/*********************************************************************

Initializing the Z8530 asynchronuously

(using pointer referring to memory map I/O device)

/**************************************************************************

#include

"stdio.h"

#define

spaddress

0x22FS5

/* status port address */

#define

dpaddress

0x22F87

/* dataport address */

#define

rxbit

/* receive ready bit */

#define

txbit

/* transmit ready bit */

#define

tablesize

main ()

{

unsigned char table[tablesize];

unsigned long *ptspa, *ptdpa;

unsigned char value;

int i;

/* data table for initialization */

table[0]=0x9;

/* address WR9 */

table[l]=0xC0;

/* hardware reset SCC */

table[2]=0x3;

/* address WR3 */

table[3]=0x41;

/* set # of bits etc. */

table[4]=0x4;

/* address WR4 */

table[5]=0x4C;

/* misc mode */

table[6]=0x5;

/* address WR5 */

table[7]=0x28;

/* bits/char and TXEN */

table[8]=0xB.

/* address WRIi */

table[9]=0x56;

/* select baud generator */

table[l0]=0xC;

/* address WR12 */

table[ll]=0xC;

/* upper TC */

table[l2]=0xD;

/* address WR13 */

table[13]=0;

/* lower TC */

table[l4]=0xE;

/* address WR14 */

table[l5]=0x7;

/* set DTR/REQ enable baud generator */

/* output data from table to perfore initialization */

ptspa=spaddress;

/* pointer to status port address */

ptdpa=dpaddress;

/* pointer to data port address */

value=*ptspa;

/* read status to set the set state machine */

for (i--0; i<tablesize; i++)

/* perform initialization */

*ptspa=table[i];

/* receive and echo character routine */

for (

;;)

{

while (((*ptspa) & rxbit) == 0);

/* wait for receive ready bit */

value=*ptdpa;

/* receive character */

while (((*ptspa) & txbit) == 0);

/* wait for transmit ready bit */

*ptdpa--value'

/* transmit character */

Figure 7-10. SCC Initialization - Memory Mapped

AM8530 Datasheet(PDF) 168 Page - Advanced Micro Devices

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