參數(shù)資料
型號(hào)： TLV5614IYZR
廠商： TEXAS INSTRUMENTS INC
元件分類： DAC
英文描述： SERIAL INPUT LOADING, 9 us SETTLING TIME, 12-BIT DAC, UUC16
封裝： GREEN, DIE-16
文件頁(yè)數(shù)： 10/25頁(yè)
文件大?。?/td> 500K
代理商： TLV5614IYZR
www.ti.com
SBAS401 – DECEMBER 2006
The serial port of the controller is used in Mode 0, which transmits eight bits of data on RxD, accompanied by a
synchronous clock on TxD. Two writes concatenated together are required to write a complete word to the
TLV5614IYZ. The CS and FS signals are provided in the required fashion through control of IO port 3, which has
bit-addressable outputs.
Processor: 80C51
;
; Description:
;
; This program generates a differential in-phase
(sine) on (OUTA-OUTB) ; and its quadrature (cosine)
as a differential signal on (OUTC-OUTD).
;
; 1998, Texas Instruments Inc.
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
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 cosine48
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
A_MSB_TX:
JNB TI,A_MSB_TX ; wait for transmit to complete
CLR TI ; clear for new transmit
18
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