STC micro STC8A8K64D4 Series - Timer 0 (Pulse Width Measurement for High-Level Width of INT0)

STC8A8K64D4 Series Manual
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CPL P1.0 ;Test port
RETI
MAIN:
MOV SP, #5FH
MOV P0M0, #00H
MOV P0M1, #00H
MOV P1M0, #00H
MOV P1M1, #00H
MOV P2M0, #00H
MOV P2M1, #00H
MOV P3M0, #00H
MOV P3M1, #00H
MOV P4M0, #00H
MOV P4M1, #00H
MOV P5M0, #00H
MOV P5M1, #00H
MOV TMOD,#04H ;External counting mode
MOV TL0,#0FFH
MOV TH0,#0FFH
SETB TR0 ;Start timer
SETB ET0 ;Enable timer interrupt
SETB EA
JMP $
END
13.5.6 Timer 0 (Pulse width measurement for high-level width of INT0)
C language code
//Operating frequency for test is 11.0592MHz
#include "reg51.h"
#include "intrins.h"
sfr AUXR = 0x8e;
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xc9;
sfr P5M0 = 0xca;
void INT0_Isr() interrupt 0
{
P0 = TL0; //TL0 is the low byte of the measured value