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UPD17708 Datasheet(PDF) 159 Page - NEC

No. de pieza UPD17708
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD17708 Datasheet(HTML) 159 Page - NEC

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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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