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Chapter 3
Microcomputer Basics 1
8-bit timer operation III−43
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) */
}
}