參數(shù)資料
型號： TLV5614CPWR
廠商： TEXAS INSTRUMENTS INC
元件分類： DAC
英文描述： SERIAL INPUT LOADING, 9 us SETTLING TIME, 12-BIT DAC, PDSO16
封裝： GREEN, PLASTIC, TSSOP-16
文件頁數(shù)： 17/34頁
文件大?。?/td> 737K
代理商： TLV5614CPWR
TLV5614
2.7-V TO 5.5-V 12-BIT 3-
S QUADRUPLE DIGITAL-TO-ANALOG CONVERTERS
WITH POWER DOWN
SLAS188B – SEPTEMBER 1998 – REVISED APRIL 2003
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
MOV
A,R7
; pointer in R7
ADD
A,#0FH
; add 15 – already done one INC
ANL
A,#03FH
; wrap back round to 0 if > 64
MOV
R7,A
; pointer back in R7
MOVC
A,@A+DPTR
; get DAC D msb from the table
ORL
A,#03H
; set control bits to DAC D address
B_LSB_TX:
JNB
TI,B_LSB_TX
; wait for DAC B lsb transmit to complete
SETB
T1
; toggle FS
CLR
T1
CLR
TI
; clear for new transmit
MOV
SBUF,A
; and send out the msb of DAC D
INC
R7
; increment the pointer in R7
MOV
A,R7
; to get the next byte from the table
MOVC
A,@A+DPTR
; which is the lsb of this sample, now in ACC
D_MSB_TX:
JNB
TI,D_MSB_TX
; wait for transmit to complete
CLR
TI
; clear for new transmit
MOV
SBUF,A
; and send out the lsb of DAC D
; increment the rolling pointer to point to the next sample
; ready for the next interrupt
MOV
A,rolling_ptr
ADD
A,#02H
; add 2 to the rolling pointer
ANL
A,#03FH
; wrap back round to 0 if > 64
MOV
rolling_ptr,A ; store in memory again
D_LSB_TX:
JNB
TI,D_LSB_TX
; wait for DAC D lsb transmit to complete
CLR
TI
; clear for next transmit
SETB
T1
; FS high
SETB
T0
; CS high
POP
ACC
POP
PSW
RETI
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Stack needs definition
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
RSEG
STACK
DS
10h
; 16 Byte Stack!
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Main program code
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
RSEG
MAIN
start:
MOV
SP,#STACK–1
; first set Stack Pointer
CLR A
MOV
SCON,A
; set serial port 0 to mode 0
MOV
TMOD,#02H
; set timer 0 to mode 2 – auto–reload
MOV
TH0,#038H
; set TH0 for 5kHs interrupts
SETB
INT1
; set LDAC = 1
SETB
T1
; set FS = 1
SETB
T0
; set CS = 1
SETB
ET0
; enable timer 0 interrupts
SETB
EA
; enable all interrupts
MOV
rolling_ptr,A ; set rolling pointer to 0
SETB
TR0
; start timer 0
always:
SJMP
always
; while(1) !
RET
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Table of 32 sine wave samples used as DAC data
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
RSEG
SINTBL
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