參數(shù)資料
型號(hào): AD8801AN
廠商: ANALOG DEVICES INC
元件分類: DAC
英文描述: Octal 8-Bit TrimDAC with Power Shutdown
中文描述: OCTAL, SERIAL INPUT LOADING, 0.6 us SETTLING TIME, 8-BIT DAC, PDIP16
封裝: PLASTIC, DIP-16
文件頁(yè)數(shù): 14/16頁(yè)
文件大小: 213K
代理商: AD8801AN
REV. A
–14–
AD8801/AD8803
PSHY
PSHA
*
* Enter Contents of SDI1 Data Register
*
LDAA
ST AA
*
* Enter Contents of SDI2 Data Register
*
LDAA
ST AA
*
LDX
LDY
*
* Reset AD8801 to one-half scale (AD8803 does not have a Reset input)
*
BCLR
PORT C,Y $02
BSET
PORT C,Y $02
*
* Get AD8801/03 ready for data input
*
BCLR
PORT D,Y $20
*
T FRLP
LDAA
0,X
ST AA
SPDR
*
WAIT
LDAA
SPSR
BPL
WAIT
*
INX
CPX
#SDI2+1
BNE
T FRLP
*
* Update AD8801 output
*
BSET
PORT D,Y $20
*
PULA
PULY
PULX
RT S
$0000
SDI1
Hi-byte data loaded from memory
SDI1 = data in location 0000H
$0001
SDI2
Low-byte data loaded from memory
SDI2 = Data in location 0001H
#SDI1
#$1000
Stack pointer at 1st byte to send via SDI
Stack pointer at on-chip registers
Assert /RS
De-assert /RS
Assert /CS
Get a byte to transfer via SPI
Write SDI data reg to start xfer
Loop to wait for SPIF
SPIF is the MSB of SPSR
(when SPIF is set, SPSR is negated)
Increment counter to next byte for xfer
Are we done yet
If not, xfer the second byte
Latch register & update AD8801
When done, restore registers X , Y & A
** Return to Main Program **
Listing 3. AD8801/AD8803 to MC68HC11 Interface Program Source Code
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