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UPD17015GS Datasheet(PDF) 105 Page - NEC

Part # UPD17015GS
Description  4-BIT SINGLE-CHIP MICROCONTROLLER FOR PORTABLE RADIOS
PDF  120 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17015GS Datasheet(HTML) 105 Page - NEC

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 105 / 120 page
background image
105
µPD17015
Example
Sample program
START:
; Program address 0000H
; 1
Reset processing
; 2
SKT1
BTM0CY
; Power failure detection
BR
INITIAL
BACKUP:
; 3
Clock updating
BR
MAIN
INITIAL:
;
4
Initialization
MAIN:
Main process
SKT1
BTM0CY
BR
MAIN
Clock updating
BR
MAIN
Operation example
3.0 V
0 V
H
L
H
L
V
DD
CE
BTM0CY flag
set pulse
500 ms
Power failure detection
When the processing time
of
+
is 125 ms or longer,
a CE reset is applied midway
through processing
.
When the processing time
of
+
is too long, a
CE reset is applied.
CE reset
CE reset
1
1
2
Power failure detection
2
3
3
4
1
1
4
4



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