參數(shù)資料
型號: TLV5606IDR
廠商: TEXAS INSTRUMENTS INC
元件分類: DAC
英文描述: SERIAL INPUT LOADING, 9 us SETTLING TIME, 10-BIT DAC, PDSO8
封裝: GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù): 8/27頁
文件大小: 636K
代理商: TLV5606IDR
TLV5606
2.7V TO 5.5V LOW POWER 10BIT DIGITALTOANALOG
CONVERTERS WITH POWER DOWN
SLAS259B DECEMBER 1999 REVISED APRIL 2004
16
WWW.TI.COM
APPLICATION INFORMATION
LJMP
start
; Execution starts at address 0 on powerup.
;
; Code in the timer0 interrupt vector
;
CSEG AT
0BH
LJMP
timer0isr ; Jump vector for timer 0 interrupt is 000Bh
;
; Define program variables
;
RSEG
VAR1
rolling_ptr: DS
1
;
; Interrupt service routine for timer 0 interrupts
;
RSEG
ISR
timer0isr:
PUSH
PSW
PUSH
ACC
CLR
T0
; set CSB low
CLR
T1
; set FS low
; The signal to be output on the dac is a sine function. One cycle of a sine wave is
; held in a table @ sinevals as 32 samples of msb, lsb pairs (64 bytes). The pointer,
; rolling_ptr, rolls round the table of samples incrementing by 2 bytes (1 sample) on
; each interrupt (at the end of this routine).
MOV
DPTR,#sinevals
; set DPTR to the start of the table of sine signal values
MOV
A,rolling_ptr
; ACC loaded with the pointer into the sine table
MOVC
A,@A+DPTR
; get msb from the table
ORL
A, #00H
; set control bits
MOV
SBUF,A
; send out msb of data word
MOV A,rolling_ptr ; move rolling pointer in to ACC
INC
A
; increment ACC holding the rolling pointer
MOVC
A,@A+DPTR
; which is the lsb of this sample, now in ACC
MSB_TX:
JNB
TI, MSB_TX
; wait for transmit to complete
CLR
TI
; clear for new transmit
MOV
SBUF,A
; and send out the lsb
LSB_TX:
JNB
TI, LSB_TX
; wait for lsb transmit to complete
SETB
T1
; set FS = 1
CLR
TI
; clear for new transmit
MOV
A,rolling_ptr
; load ACC with rolling pointer
INC
A
; increment the ACC twice, to get next sample
INC
A
ANL
A,#03FH
; wrap back round to 0 if >64
MOV
rolling_ptr,A
; move value held in ACC back to the rolling pointer
SETB
T0
; CSB high
POP
ACC
POP
PSW
RETI
;
; Set up stack
;
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