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参数资料
型号： LTC1289CCSW#PBF
厂商： Linear Technology
文件页数： 17/28页
文件大小： 0K
描述： IC DATA ACQ SYS 12BIT 3V 20-SOIC
标准包装： 38
类型： 数据采集系统（DAS）
分辨率（位）： 12 b
采样率（每秒）： 25k
数据接口： 串行，并联
电压电源： 双 ±
电源电压： ±3.3V
工作温度： 0°C ~ 70°C
安装类型： 表面贴装
封装/外壳： 20-SOIC（0.295"，7.50mm 宽）
供应商设备封装： 20-SOIC
包装： 管件
24
LTC1289
1289fb
LDA #$50
Configuration data for SPCR
STA $0A
Load configuration data into $0A
LDA #$FF
Configuration data for port C DDR
STA $06
Load configuration data into port C DDR
BSET 0, $02
Make sure CS is high
JSR READ –/+
Dummy read configures LTC1289 for
next read
JSR READ +/–
Read CH6 with respect to CH7
JSR READ –/+
Read CH7 with respect to CH6
JSR CHK SIGN
Determines which reading has valid
data, converts to 2's complement and
stores in RAM
READ – / + : LDA #$3F
Load DIN word for LTC1289 into ACC
JSR TRANSFER
Read LTC1289 routine
LDA $60
Load MSBs from LTC1289 in ACC
STA $71
Store MSBs in $71
LDA $61
Load LSBs from LTC1289 in ACC
STA $72
Store LSBs in $72
RTS
Return
U
S
A
O
PPLICATI
TYPICAL
SNEAK-A-BIT Code for the LTC1289 Using the MC68HC05C4
SNEAK-A-BIT Code
SNEAK-A-BIT Code for the LTC1289 Using the MC68HC05C4
MNEMONIC
DESCRIPTION
DOUT from LTC1289 in MC68HC05C4 RAM
Location $77
B12 B11 B10 B9 B8 B7 B6 B5
Location $87
B4 B3 B2 B1 B0 filled with 0s
DIN words for LTC1289
Sign
LSB
MUX Addr.
UNI
MSBF
Word
Length
DIN1
0
1
DIN2
0
1
DIN3
0
1
(ODD/SIGN)
LTC1289 TA05
MNEMONIC
DESCRIPTION
READ +/–:
LDA
#$7F
Load DIN word for LTC1289 into ACC
JSR
TRANSFER
Read LTC1289 routine
LDA
$60
Load MSBs from LTC1289 into ACC
STA
$73
Store MSBs in $73
LDA
$61
Load LSBs from LTC1289 into ACC
STA
$74
Store LSBs in $74
RTS
Return
TRANSFER: BCLR 0, $02
CS goes low
STA
$0C
Load DIN into SPI. Start transfer
LOOP 1:
TST
$0B
Test status of SPIF
BPL
LOOP 1
Loop to previous instruction if not done
LDA
$0C
Load contents of SPI data reg into ACC
STA
$0C
Start next cycle
STA
$60
Store MSBs in $60
LOOP 2:
TST
$0B
Test status of SPIF
BPL
LOOP 2
Loop to previous instruction if not done
BSET 0, $02
CS goes high
LDA
$0C
Load contents of SPI data reg into ACC
STA
$61
Store LSBs in $61
RTS
Return
CHK SIGN: LDA
$73
Load MSBs of +/– read into ACC
ORA $74
Or ACC (MSBs) with LSBs of +/– read
BEQ
MINUS
If result is 0 goto minus
CLC
Clear carry
ROR $73
Rotate right $73 through carry
ROR $74
Rotate right $74 through carry
LDA
$73
Load MSBs of +/– read into ACC
STA
$77
Store MSBs in RAM locations $77
LDA
$74
Load LSBs of +/– read into ACC
STA
$87
Store LSBs in RAM location $87
BRA END
Goto end of routine
MINUS:
CLC
Clear carry
ROR $71
Shift MSBs of –/+ read right
ROR $72
Shift LSBs of –/+ read right
COM $71
1's complement of MSBs
COM $72
1's complement of LSBs
LDA
$72
Load LSBs into ACC
ADD #$01
Add 1 to LSBs
STA
$72
Store ACC in $72
CLRA
Clear ACC
ADC $71
Add with carry to MSBs. Result in ACC
STA
$71
Store ACC in $71
STA
$77
Store MSBs in RAM locations $77
LDA
$72
Load LSBs in ACC
STA
$87
Store LSBs in RAM location $87
END:
RTS
Return
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