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Description: Using 8253 as a second timer, 0.1 seconds per cycle timer interrupt 8253, 8253 received OUT0 of the IRO-end 8259, 8259 to 8086 generate an interrupt request, interrupt type number 08H. Procedures for opening seconds, minutes, hours, register unit, the number of seconds register each entry age of 60, sub-register value plus 1, and 0 seconds register ching. Sub-registers each counting the age of 60, hour register value plus 1, while sub-register-ching 0. Seconds, minutes and hours registers in the binary value into BCD code, to send six LED digital tube display.
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