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UPD17708 Datasheet(PDF) 177 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) 177 Page - NEC

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13.4.4 Example of using timer 1
(1) Modulo timer
The modulo timer is used for time management by generating timer 1 interrupt at fixed intervals.
An example of a program is shown below.
This program executes processing B every 500
µs.
TM1DATA
DAT
0032H
; Count data = 50
START:
BR
INITIAL
; Reset address
; Interrupt vector address
NOP
; SIO1
NOP
; SIO0
NOP
; TM3
NOP
; TM2
BR
INT_TM1
; TM1
NOP
; TM0
NOP
; INT4
NOP
; INT3
NOP
; INT2
NOP
; INT1
NOP
; INT0
NOP
; Down edge of CE
INITIAL:
INITFLG
NOT TM1EN, TM1RES, NOT TM1CK1, NOT TM1CK0
;
(Stop)
, (Reset) ,
(Basic clock = 10
µs)
MOV
DBF0, #TM1DATA
MOV
DBF1, #TM1DATA SHR4 AND 0FH
PUT
TM1, DBF
SET1
TM1EN
; START
SET1
IPTM1
; Enables timer 1 interrupt
EI
LOOP:
Processing A
BR
LOOP
INT_TM1:
PUT
DBFSTK, DBF
; Saves data buffer
Processing B
GET
DBF, DBFSTK
EI
RETI
; Return
END



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