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PCD
#endif
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2)
main()
{
printf("Press any key to begin\n\r");
getc();
printf("1 khz signal activated\n\r");
while (TRUE)
{
output_high (PIN_B0);
delay_us(500);
output_low(PIN_B0);
delay_us(500);
}
}
/////////////////////////////////////////////////////////////////
///
///
EX_STWT.C
This program uses the RTCC (timer0) and interrupts
///
///
///
///
to keep a real time seconds counter.
watch function is then implemented.
A simple stop
Configure the
///
///
///
///
CCS prototype card as follows, insert jumpers from:
11 to 17 and 12 to 18.
///
///
/////////////////////////////////////////////////////////////////
#include <16C84.H>
#use delay (clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2_
#define INTS_PER_SECOND 76
byte seconds;
#int_rtcc
clock_isr() {
//(20000000/(4*256*256))
//Number of interrupts left
//before a second has elapsed
//This function is called
//every time the RTCC (timer0)
//overflows (255->0)
//For this program this is apx
//76 times per second.
if(--int_count==0)
{
++seconds;
int_count=INTS_PER_SECOND;
}
}
main() {
byte start;
int_count=INTS_PER_SECOND;
set_rtcc(0);
setup_counters (RTCC_INTERNAL, RTCC_DIV_256);
enable_interrupts (INT_RTCC);
enable_interrupts(GLOBAL)
do {
printf ("Press any key to begin. \n\r");
354
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