參數(shù)資料
型號(hào): TLV5604(中文)
廠商: Texas Instruments, Inc.
英文描述: 2.7V TO 5.5V 10-Bit DAC With Serial Power Down(具有掉電功能的2.7V至5.5V,10位串行3微秒四路DAC)
中文描述: 2.7V至5.5V 10位DAC,具有串行斷電(具有掉電功能的為2.7V至5.5V之間,10位串行3微秒四路援會(huì))
文件頁(yè)數(shù): 17/22頁(yè)
文件大小: 507K
代理商: TLV5604(中文)
==1999-3-15==
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TLV5604
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IO
ú
3
μòùDèμù
êìá1
CS
FS
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;
; 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
SETB
INT1
INT1
; pulse LDAC low
; 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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