TLV5639CDW datasheet(14/17 Pages) TI

14 / 17 page

TLV5639C, TLV5639I

2.7 V TO 5.5 V LOW POWER 12-BIT DIGITAL-TO-ANALOG

CONVERTERS WITH INTERNAL REFERENCE AND POWER DOWN

SLAS189 – MARCH 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

; File:

RAMP.ASM

; Function:

ramp generation with TLV5639

; Processors:

TMS320C203

;

;–––––––––– I/O and memory mapped regs –––––––––––––––

.include “regs.asm”

dac_data

.equ

0084h

dac_ctrl

.equ

0085h

;––––––––––––– vectors –––––––––––––––––––––––––––––––

.ps

start

INT1

INT23

TIM_ISR

––––––––––Main Program––––––––––

.ps

1000h

.entry

start:

ldp

; set data page to 0

; disable interrupts

setc

INTM

; disable maskable interrupts

splk

#0ffffh, IFR

splk

#0004h,

IMR

; set up the timer

splk

#0000h,

60h

splk

#0042h,

61h

out

61h, PRD

out

60h, TIM

splk

#0c2fh,

62h

out

62h,

TCR

splk

#0011h,

62h

; set up the DAC

; SPD=1

(FAST mode) and ; REF1=1

(2.048 V internal ref enable)

out

62h, dac_ctrl

clrc

INTM

; enable interrupts

; loop forever!

idle

–––––––––– Interrupt Service Routines––––––––––

INT1:

ret

; do nothing and return

INT23:

ret

; do nothing and return

TIM_ISR:

; timer interrupt handler

add

#1h

; increment accumulator

sacl

60h

out

60h, dac_data

; write to DAC

clrc

intm

; re-enable interrupts

ret

; return from interrupt

.END

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