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UPD17015 Datasheet(PDF) 82 Page - NEC

Part # UPD17015
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

UPD17015 Datasheet(HTML) 82 Page - NEC

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82
µPD17015
14.2.6
When Two Release Conditions Set Simultaneously
When two halt release conditions are set, the halt state is released if even one of the set release conditions is
satisfied.
The following example indicates how to judge two release conditions when they are satisfied simultaneously.
Example
Judging between two release conditions when they are satisfied simultaneously
HLTBTMR
DAT
0010B
HLTKEY
DAT
0001B
START:
SET3
P0C2, P0C1, P0C0
; Outputs key source signal.
BTMRUP:
Process A
RET
KEYDEC:
Process B
RET
LOOP:
HALT
HLTBTMR OR HLTKEY
; Sets halt release conditions to basic
; timer 0 or key input.
SKF1
BTM0CY
; Detects BTM0CY flag
CALL
BTMRUP
; If set, executes timer carry processing.
SKF3
P0B2, P0B1, P0B0
; Key input latch processing
CALL
KEYDEC
; If latched, executes key input processing
BR
LOOP



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