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參數資料
| 型號： | TLV5633IPWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 3.5 us SETTLING TIME, 12-BIT DAC, PDSO20 |
| 封裝： | GREEN, PLASTIC, TSSOP-20 |
| 文件頁數： | 7/25頁 |
| 文件大小： | 486K |
| 代理商： | TLV5633IPWG4 |
www.ti.com
SOFTWARE
SLAS190C – MARCH 1999 – REVISED SEPTEMBER 2006
In the following example, the code generates a waveform at 20 KSPS with 32 samples stored in a table within
the program memory space of the microcontroller.
The waveform data is located in the program memory space at segment SINTBL beginning with the MSW of the
first 16-bit word (the 4 MSBs are ignored), followed by the LSW. Two bytes are required for each DAC word (the
table is not shown in the code example).
The program consists of two parts:
A main routine, which is executed after reset and which initializes the timer and the interrupt system of the
microcontroller.
An interrupt service routine, which reads a new value from the waveform table and writes it to the DAC.
;--------------------------------------------------------------------------------------
; File:
WAVE.A51
; Function:
wave generation with TLV5633
; Processors: 80C51 family (running at 12 MHz)
; Software:
ASM51 assembler, Keil BL51 code-banking linker
;(C) 1999 Texas Instruments
;--------------------------------------------------------------------------------------
; Program function declaration
;--------------------------------------------------------------------------------------
NAME
WAVE
MAIN
SEGMENT
CODE
ISR
SEGMENT
CODE
WAVTBL
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
;--------------------------------------------------------------------------------------
; Define program variables
;--------------------------------------------------------------------------------------
RSEG VAR1
rolling_ptr: DS 1
;--------------------------------------------------------------------------------------
; Interrupt service routine for timer 0 interrupts
;--------------------------------------------------------------------------------------
RSEG ISR
TIMER0ISR:
PUSH PSW
PUSH ACC
; The signal to be output on the dac is stored in a table
; 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, #wavetable ; set DPTR to the start of the table
MOV
R0, #001H
; R0 selects DAC MSW
MOV
A,rolling_ptr
; ACC loaded with the pointer into the wave table
MOVC A,@A+DPTR
; get msb from the table
MOVX @R0, A
; write DAC MSW
MOV
R0, #000H
; R0 selects DAC LSW
MOV
A,rolling_ptr
; move rolling pointer back 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
MOVX @R0, A
; write DAC LSW
MOV
A,rolling_ptr
; load ACC with rolling pointer again
INC
A
; increment the ACC twice, to get next sample
INC
A
ANL
A,#003FH
; wrap back round to 0 if >64
MOV
rolling_ptr,A
; move value held in ACC back to the rolling pointer
15
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