STC micro STC8A8K64D4 Series Reference Manual page 461

STC8A8K64D4 Series Manual
CMPCR2 = 0x10;
CMPCR1 = 0x00;
CMPCR1 &= ~0x02;
CMPCR1 |= 0x80;
while (1)
{
v = 0x00;
P1 = 0xfe;
delay();
if (!(CMPCR1 & 0x01)) goto ShowVol;
v = 0x01;
P1 = 0xfd;
delay();
if (!(CMPCR1 & 0x01)) goto ShowVol;
v = 0x03;
P1 = 0xfb;
delay();
if (!(CMPCR1 & 0x01)) goto ShowVol;
v = 0x07;
P1 = 0xf7;
delay();
if (!(CMPCR1 & 0x01)) goto ShowVol;
v = 0x0f;
P1 = 0xef;
delay();
if (!(CMPCR1 & 0x01)) goto ShowVol;
v = 0x1f;
P1 = 0xdf;
delay();
if (!(CMPCR1 & 0x01)) goto ShowVol;
v = 0x3f;
ShowVol:
P1 = 0xff;
P0 = ~v;
}
}
Assembly code
;Operating frequency for test is 11.0592MHz
CMPEXCFG EQU
P_SW2 DATA
CMPCR1 DATA
CMPCR2 DATA
P0M1 DATA
P0M0 DATA
P1M1 DATA
P1M0 DATA
P2M0 DATA
P2M1 DATA
P2M1 DATA
P2M0 DATA
P3M1 DATA
P3M0 DATA
0FEFAH
0BAH
0E6H
0E7H
093H
094H
091H
092H
096H
095H
095H
096H
0B1H
0B2H
//Output comparator result after 16 debounce clocks
//Disable comparator output
//Enable comparator module
//Voltage <2.5V
//P1.0 outputs 0
//Voltage>2.5V
//P1.1 outputs 0
//Voltage>3.0V
//P1.2 outputs 0
//Voltage>3.5V
//P1.3 outputs 0
//Voltage>4.0V
//P1.4 outputs 0
//Voltage>4.5V
//P1.5 outputs 0
//Voltage>5.0V
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