Cpum

Chapter 3

Microcomputer Basics 1

asm ("	nop\n");
asm ("	nop\n");
TM1MD	= TM1MD 0x80;		/* Start the counter */
while(1){
}
}
/*----------------------------------------------
----------------------------------------------Operation initial setting			*/
void initialize(void)
{
asm ("	and	0xF0FF,PSW\n");	/* Disable all maskable interrupts */
asm ("	nop\n");
asm ("	nop\n");
CPUM	= 0x0000;		/* Set normal mode */
}
/*-----------------------------------------------
-----------------------------------------------Timer 1 underflow			*/
void int_timer1(void)
{
if(P4OUT & 0x10){
P4OUT = 0x00;			/* Set P44 Low(VSS level) */
}
else{
P4OUT = 0x10;			/* Set P44 High(VDD level) */
}
}

8-bit timer operation

III−43