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UPD17062 Datasheet(PDF) 150 Page - Renesas Technology Corp |
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UPD17062 Datasheet(HTML) 150 Page - Renesas Technology Corp |
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150 / 298 page  148 µPD17062 12.5.1 Example of Using a Timer Based on a Timer Interrupt An example follows. Example BR AAA ; Branches to AAA. TIMER: ; Program address 0003H ADD M1, #0001B ; Add 1 to M1. SKT1 CY ; Tests the CY flag. BR BBB ; Returns if no carry is generated. Process A BBB: EI RETI AAA: INITFLG NOT BTM0ZX, NOT BTM0CK2, NOT BTM0CK1, NOT BTM0CK0 ; Built-in macro ; Specifies the timer interrupt pulse as 5 ms. MOV M1, #0000B ; Clears the content of M1 to 0. SET1 IPBTM0 ; Enables a timer interrupt. EI ; Enables all types of interrupts. LOOP: Process B BR LOOP This program performs process A at every 80 ms. At this point, note the following: Accepting an interrupt request causes a DI state automatically, and the IRQBTM0 flag is set to 1 even in the DI state. In other words, if process A takes 5 ms or longer, an interrupt request will be accepted immediately when a return is made by a RETI instruction, thus disabling process B from being performed. |
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