參數(shù)資料
型號: AD8804ARZ-REEL
廠商: Analog Devices Inc
文件頁數(shù): 4/16頁
文件大小: 0K
描述: IC DAC 8BIT 12CH W/SD 20SOIC
產(chǎn)品培訓模塊: Data Converter Fundamentals
DAC Architectures
標準包裝: 1,000
系列: TrimDAC®
設置時間: 600ns
位數(shù): 8
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 12
電壓電源: 單電源
功率耗散(最大): 60µW
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
供應商設備封裝: 20-SOIC W
包裝: 帶卷 (TR)
輸出數(shù)目和類型: 12 電壓,單極
采樣率(每秒): 1.7M
AD8802/AD8804
REV. 0
–12–
*
* AD8802/AD8804 to M68HC11 Interface Assembly Program
*
* M68HC11 Register definitions
*
PORTC
EQU
$1003
Port C control register
*
“0,0,0,0;0,0,RS/, SHDN/”
DDRC
EQU
$1007
Port C data direction
PORTD
EQU
$1008
Port D data register
*
“0,0,/CS,CLK;SDI,0,0,0”
DDRD
EQU
$1009
Port D data direction
SPCR
EQU
$1028
SPI control register
*
“SPIE,SPE,DWOM,MSTR;CPOL,CPHA,SPR1,SPR0”
SPSR
EQU
$1029
SPI status register
*
“SPIF,WCOL,0,MODF;0,0,0,0”
SPDR
EQU
$102A
SPI data register; Read-Buffer; Write-Shifter
*
* SDI RAM variables:
SDI1 is encoded from 0H to 7H
*
SDI2 is encoded from 00H to FFH
*
AD8802/AD8804 requires two 8-bit loads; upper 4 bits
*
of SDI1 are ignored. AD8802/AD8804 address bits in last
*
four LSBs of SDI1.
*
SDI1
EQU
$00
SDI packed byte 1 “0,0,0,0;A3,A2,A1,A0”
SDI2
EQU
$01
SDI packed byte 2 “DB7–DB4;DB3–DB0”
*
* Main Program
*
ORG
$C000
Start of user’s RAM in EVB
INIT
LDS
#$CFFF
Top of C page RAM
*
* Initialize Port C Outputs
*
LDAA
#$03
0,0,0,0;0,0,1,1
*
/RS-Hi, /SHDN-Hi
STAA
PORTC
Initialize Port C Outputs
LDAA
#$03
0,0,0,0;0,0,1,1
STAA
DDRC
/RS and /SHDN are now enabled as outputs
*
* Initialize Port D Outputs
*
LDAA
#$20
0,0,1,0;0,0,0,0
*
/CS-Hi,/CLK-Lo,SDI-Lo
STAA
PORTD
Initialize Port D Outputs
LDAA
#$38
0,0,1,1;1,0,0,0
STAA
DDRD
/CS,CLK, and SDI are now enabled as outputs
*
* Initialize SPI Interface
*
LDAA
#$53
STAA
SPCR
SPI is Master,CPHA=0,CPOL=0,Clk rate=E/32
*
* Call update subroutine
*
BSR
UPDATE
Xfer 2 8-bit words to AD8402
JMP
$E000
Restart BUFFALO
*
* Subroutine UPDATE
*
UPDATE
PSHX
Save registers X, Y, and A
PSHY
PSHA
*
* Enter Contents of SDI1 Data Register
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