参数资料
型号: AD7303BRZ-REEL
厂商: Analog Devices Inc
文件页数: 7/16页
文件大小: 0K
描述: IC DAC 8BIT DUAL R-R 8-SOIC
产品培训模块: Data Converter Fundamentals
DAC Architectures
标准包装: 2,500
设置时间: 1.2µs
位数: 8
数据接口: 串行
转换器数目: 2
电压电源: 单电源
功率耗散(最大): 6.93mW
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
输出数目和类型: 2 电压,单极;2 电压,双极
采样率(每秒): 833k
AD7303
–15–
REV. 0
LDAA
#$18
0, 0, 0, 1, 1, 0, 0, 0
*
SCLK and DIN enabled as outputs
LDAA
#$53
STAA
SPCR
SPI on, Master mode, CPOL=0, CPHA=0, Clock rate =E/32
*
BSR
UPDATE
Update AD7303 output.
JMP
#$E000
Restart.
*
UPDATE
PSHX
Save relevant registers.
PSHY
PSHA
*
LDAA
#$00
Control Word "0, 0, 0, 0, 0, 0, 0, 0"
STAA
DIN 1
Load both DAC A and DAC B DAC registers from shift register
with internal reference selected.
LDAA
#$AA
Data Word "1, 0, 1, 0, 1, 0, 1, 0"
STAA
DIN 2
*
LDX
#DIN1
Stack pointer at first first byte to send via DIN 1.
LDY
#$1000
Stack pointer at on chip registers.
*
BCLR
PORTC,Y $80
Assert SYNC.
TRANSFER
LDAA
0,X
Get BYTE to transfer via SPI.
STAA
SPDR
Write to DIN register to start transfer.
*
WAIT
LDAA
SPSR
Wait for SPIF to be set to indicate that transfer has been completed.
BPL
WAIT
SPIF is the MSB of the SPCR. SPIF is automatically reset if in a set
state when the status register is read.
*
INX
Increment counter for transfer of second byte.
CPX
#DIN 2+1
16 bits transferred?
BNE
TRANSFER
If not, transfer second BYTE.
*Execute instruction
BSET
PORTC,Y $80
Bring SYNC back high.
PULA
Restore registers.
PULY
PULX
RTS
Return to main program.
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