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UPD17708 Datasheet(PDF) 169 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) 169 Page - NEC

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13.3.4 Example of using timer 0
(1) Modulo counter mode
The modulo counter mode is used for time management by generating timer 0 interrupt at fixed intervals.
An example of a program is shown below.
This program executes processing B every 500
µs.
TM0DATA
DAT
0032H
; MODULO DATA = 50
START:
BR
INITIAL
; Reset address
; Interrupt vector address
NOP
; SIO1
NOP
; SIO0
NOP
; TM3
NOP
; TM2
NOP
; TM1
BR
INT_TM0
; TM0
NOP
; INT4
NOP
; INT3
NOP
; INT2
NOP
; INT1
NOP
; INT0
NOP
; Down edge of CE
INITIAL:
INITFLG
NOT TM0EN, TM0RES, NOT TM0CK1, NOT TM0CK0
;
(Stop)
, (Reset) ,
(Basic clock = 10
µs)
CLR1
TM0MD
; Modulo mode
MOV
DBF0, #(TM0MDATA SHR 0) AND 0FH
MOV
DBF1, #(TM0MDATA SHR 4) AND 0FH
PUT
TM0M, DBF
; Sets count data
SET1
IPTM0
; Enables timer 0 interrupt
EI
SET1
TM0EN
; Starts timer 0
LOOP:
Processing A
BR
LOOP
INT_TM0:
Processing B
; Timer 0 interrupt service
EI
RETI
; Return



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