參數(shù)資料
型號(hào)： TLV5604IDG4
廠商： TEXAS INSTRUMENTS INC
元件分類： DAC
英文描述： SERIAL INPUT LOADING, 8.5 us SETTLING TIME, 10-BIT DAC, PDSO16
封裝： GREEN, PLASTIC, SOIC-16
文件頁數(shù)： 14/31頁
文件大?。?/td> 572K
代理商： TLV5604IDG4
TLV5604
2.7-V TO 5.5-V 10-BIT 3-
S QUADRUPLE DIGITAL-TO-ANALOG CONVERTERS
WITH POWER DOWN
SLAS176B – DECEMBER 1997 – REVISED JULY 2002
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
;––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Processor:
80C51
;
; Description:
;
; This program generates a differential in–phase (sine) on (OUTA–OUTB) and it’s
; quadrature (cosine) as a differential signal on (OUTC–OUTD).
;
1998, Texas Instruments Incorporated
;––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
NAME
GENIQ
MAIN
SEGMENT
CODE
ISR
SEGMENT
CODE
SINTBL
SEGMENT
CODE
VAR1
SEGMENT
DATA
STACK
SEGMENT
IDATA
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Code start at address 0, jump to start
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
CSEG
AT
0
LJMP
start
; Execution starts at address 0 on power–up.
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Code in the timer0 interrupt vector
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
CSEG
AT
0BH
LJMP
timer0isr ; Jump vector for timer 0 interrupt is 000Bh
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Global variables need space allocated
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
RSEG
VAR1
Temp_ptr:
DS
1
rolling_ptr:
DS
1
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; Interrupt service routine for timer 0 interrupts
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
RSEG
ISR
timer0isr:
PUSH
PSW
PUSH
ACC
CLR
INT1
; pulse LDAC low
SETB
INT1
; to latch all 4 previous values at the same time
; 1st thing done in timer isr => fixed period
CLR
T0
; set CS low
; The signal to be output on each 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). We have one pointer which rolls round this table,
; rolling_ptr, incrementing by 2 bytes (1 sample) on each interrupt (at the end of
; this routine).
; The DAC samples are read at an offset to this rolling pointer:
; DAC
Function
Offset from rolling_ptr
;
A
sine
0
;
B
inverse sine
32
;
C
cosine
16
;
D
inverse cosine
48
MOV
DPTR,#sinevals
; set DPTR to the start of the table of sine signal values
MOV
R7,rolling_ptr
; R7 holds the pointer into the sine table
MOV
A,R7
; get DAC A msb
MOVC
A,@A+DPTR
; msb of DAC A is in the ACC
CLR
T1
; transmit it – set FS low
MOV
SBUF,A
; send it out the serial port
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
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