TLV5616C, TLV5616I

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

CONVERTERS WITH POWER DOWN

SLAS152B – DECEMBER 1997 – REVISED MARCH 1999

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

;***************************************************************************************

;* Main Program

;***************************************************************************************

.ps

1000h

.entry

start:

; disable interrupts

setc

INTM

; disable maskable interrupts

splk

#0ffffh, IFR

splk

#0004h, IMR

; set up the timer to interrupt ever 205uS

splk

#0000h, 60h

splk

#00FFh, 61h

out

61h, PRD

out

60h, TIM

splk

#0c2fh, 62h

out

62h, TCR

; Configure SSP to use internal clock, internal frame sync and burst mode

splk

#0CC0Eh, 63h

out

63h, SSPCR

splk

#0CC3Eh, 63h

out

63h, SSPCR

splk

#0000h, 64h ; set initial DAC value

; 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:

lacl

64h

; restore counter value to ACC

add

#1h

; increment DAC value

and

#0FFFh

; mask 4 MSBs

sacl

64h

; store 12 bit counter value

or

#4000h

; set DAC control bits

sacl

65h

; store DAC value

out

65h, SDTR

; send data

clrc

intm

; re-enable interrupts

ret

.END