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UPD17708 Datasheet(PDF) 162 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]
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UPD17708 Datasheet(HTML) 162 Page - NEC

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162
Therefore, do not create a cyclic program that satisfies the following condition.
tSET
× 1125
= n (n: natural number)
X
tSET : B TM0CY flag setting time
X
: Cycle X step of instruction that reads BTM0CY flag
An example of a program that satisfies the above condition is shown below. Do not create such a
program.
Example
Processing A
CLR2
BTM0CK1, BTM0CK0
; Embedded macro
; Sets BTM0CY flag setting pulse to 100 ms
LOOP:
; <1>
SKT1
BTM0CY
; Embedded macro
BR
BBB
AAA:
1121 steps
BR
LOOP
BBB:
1121 steps
BR
LOOP
Because the BTM0CY flag reading instruction in <1> is repeatedly executed every 1125 instruction in
this example, CE reset is not effected if the BTM0CY flag happens to be set at the timing of instruction
in <1>.



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