NEC PD17062 - Manual (Page 188)

188
µ
PD17062
Example
Sample program
START: ; Program address 0000H
; #
Reset processing ;
;
$
SKT1 BTM0CY ; Power failure detection
BR INITIAL
BACKUP:
; %
Clock updating
BR MAIN
INITIAL:
; &
Initialization
;
(
INITFLG NOT BTM0ZX, NOT BTM0CK2, NOT BTM0CK1, BTM0CK0
; Built-in macro
; Sets timer carry FF set time to 5 ms.
MAIN:
SKT1 BTM0CY
BR MAIN
Clock updating
Operation example
5 V
0 V
V
DD
CE
Timer carry FF
set pulse
#
50 ms 50 ms
$ Power failure detection
& # %
$ Power failure
detection
CE reset
CE reset
When the processing time
of
# + % is too long, a
CE reset is applied.
When the processing time
of
# + & is 100 ms or longer,
a CE reset is applied midway
through processing
&.
(
CE reset may be applied immediately, depending on the timer carry
FF set time switching timing. When
( is executed before &,
power failure processing & may not be executed.