TLV5619

2.7 V TO 5.5 V 12-BIT PARALLEL DIGITAL-TO-ANALOG CONVERTER

WITH POWER DOWN

SLAS172C – DECEMBER 1997 – REVISED APRIL 2000

15

POST OFFICE BOX 655303

APPLICATION INFORMATION

software listing

; File: ramp.asm

; Description: This program generates a ramp.

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

.include “regs.asm”

TLV5619

.equ

0084h

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

.ps

0h

b

start

b

INT1

b

INT23

b

TIM_ISR

*********************************************************************

* Main Program

*********************************************************************

.ps

1000h

.entry

start:

ldp

#0

; 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

; enable interrupts

clrc

INTM

; enable maskable interrupts

; loop forever!

next

idle

; wait for interrupt

b

next

; all else fails stop here

done

b

done ; hang there

*********************************************************************

* Interrupt Service Routines

*********************************************************************

INT1:

ret

; do nothing and return

INT23:

ret

; do nothing and return

TIM_ISR:

; useful code

add

#1h

; increment accumulator

sacl

60h

out

60h, TLV5619

; write to DAC

clrc

intm ; re-enable interrupts

ret

; return from interrupt

.end