AD8600AP datasheet(12/16 Pages) AD

12 / 16 page

REV. 0

–12–

AD8600

* This program contains subroutines to read and write

* to the AD8600 from the 68HC11.

Additionally, a ramp

* program has been included, to continuously ramp the

* output giving a triangle wave output.

* The following connections need to be made:

68HC11

AD8600

GND

DGND1,2

PC0-PC7

DB0–DB7 respectively, data port

PB0-PB3

A0–A3 respectively, address port

PB4

PB5

PB6

R/W

PB7

portc

equ

$1003

define port addresses

portb

equ

$1004

ddrc

equ

$1007

org

$C000

read

lds

#$CFFF

subroutine to read from AD8600

ldaa

#$00

initialize port c to 00000000

staa

ddrc

configures PC0-PC7 as inputs.

ldx

#$00

points to DAC address in 68HC11 memory

ldaa

0,x

put the address in the accumulator

adda

#$70

add the control bits to the address

R/W, LD, EN are high,

CS is low.

staa

portb

output control and address on port b.

inx

points to memory location to store the data

ldaa

portc

read data from DAC

staa

0,x

Store this data in memory at address “x”

ldy

#$1000

bset

portb,y $f0

Set CS, LD, EN high

jmp

$e000

Return to BUFFALO

write

lds

#$cfff

routine to write to AD8600

ldaa

#$ff

initialize port c to 11111111

staa

ddrc

configures PC0-PC7 as outputs.

ldx

#$00

points to DAC address in 68HC11 mem

ldaa

0,x

puts the address in the accumulator

adda

#$30

set CS, R/W low and LD, EN high

staa

portb

output to portb for control and address

inx

points to memory location to store the data

ldaa

0,x

load the data into the accumulator

staa

portc

write the data to the DAC

ldy

#$1000

bclr

portb,y $30

Set LD, EN low to latch data

bset

portb,y $b0

Bring LD, EN, CS high, write is complete

jmp

$e000

Return to BUFFALO

ramp

lds

#$cfff

routine to generate a triangle wave

ldaa

#$ff

configure port c as outputs

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