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UPD17708 Datasheet(PDF) 161 Page - Renesas Technology Corp |
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UPD17708 Datasheet(HTML) 161 Page - Renesas Technology Corp |
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161 / 358 page  159 µPD17704, 17705, 17707, 17708, 17709 Example Example of compensating timer at CE reset (to detect power failure and update watch timer using BTM0CY flag) START: ; Program address 0000H Processing A ; <1> SKT1 BTM0CY ; Embedded macro ; Tests BTM0CY flag BR INITIAL ; if “0”, branches to INITIAL (power failure detection) BACKUP: ; <2> 100-ms watch updating ; Compensates watch timer because of backup (CE reset) ; Initial value “1” is stored as CE reset timer carry ; counter value LOOP: ; <3> Processing B : While performing processing B, SKF1 BTM0CY ; tests BTM0CY flag and updates watch timer BR BACKUP BR LOOP INITIAL: CLR2 BTM0CK1, BTM0CK0 ; Embedded macro ; Because power failure (power-ON reset) occurs, ; sets setting time of BTM0CY flag to 100 ms, and ; executes processing C Processing C BR LOOP Figure 13-9 shows the timing chart of the above program. |
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