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HT56R22 Arkusz danych(PDF) 57 Page - Holtek Semiconductor Inc |
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HT56R22 Arkusz danych(HTML) 57 Page - Holtek Semiconductor Inc |
57 / 127 page HT56R22/HT56R23/HT56R24/HT56R25/HT56R26 Rev. 1.30 57 December 26, 2014 · PFD Programming Example org 04h ; external interrupt vector org 08h ; Timer Counter 0 interrupt vector jmp tmr0int ; jump here when Timer 0 overflows :: org 20h ; main program :: ;internal Timer 0 interrupt routine tmr0int: : ; Timer 0 main program placed here : : begin: ;setup Timer 0 registers mov a,09bh ; setup Timer 0 preload value mov tmr0,a mov a,081h ; setup Timer 0 control register mov tmr0c,a ; timer mode and prescaler set to /2 ;setup interrupt register mov a,00dh ; enable master interrupt and both timer interrupts mov intc0,a :: set tmr0c.4 ; start Timer 0 :: Time Base The device includes a Time Base function which is used to generate a regular time interval signal. The Time Base time interval magnitude is determined using an internal 12~15 stage counter which sets the division ra- tio of the clock source. This division ratio is controlled by the time base divider configuration option. The clock source is selected using a peripheral clock configuration option. When the Time Base times out, a Time Base interrupt signal will be generated. It should be noted that as the Time Base clock source is the same as the Timer/Event Counter clock source, care should be taken when programming. |
Podobny numer części - HT56R22_14 |
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Podobny opis - HT56R22_14 |
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