The design of electronic stopwatch 1, 8253 with the system timer to provide regular units of 55ms, design stopwatch timing procedures. 2, the system timing method: PC system in 8253 Timer 0 works in the way 3, to provide an external clock as the CLK signal, frequency: f = 1.1931816MHz. Timer 0 output square wave frequency: fout = 1.1931816/65536 = 18.2Hz. Cycle square wave output Tout = 1/18.2 = 54.945ms. 8253A every 55ms caused a disruption, as a timing signal. 5945ms available for the basic time unit. INT 1AH use BIOS calls can be made of the regular units. For example: 1 seconds = 18.2 (time units)

Packet : 71477208clock.rar filelist
clock.asm

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