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TLV5614MPWREP Datasheet(PDF) 22 Page - Texas Instruments |
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TLV5614MPWREP Datasheet(HTML) 22 Page - Texas Instruments |
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22 / 32 page  TLV5614EP 2.7V TO 5.5V 12BIT 3 µs QUADRUPLE DIGITALTOANALOG CONVERTER WITH POWER DOWN SGLS355 − JUNE 2006 22 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 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 |
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