LTC1290BCSW#TR Linear Technology, LTC1290BCSW#TR Datasheet - Page 28

• Manufacturer Part Number: LTC1290BCSW#TR
• Description: IC DATA ACQ SYS 12BIT 5V 20SOIC
• Manufacturer: Linear Technology
• Type: Data Acquisition System (DAS), ADCr

Specifications of LTC1290BCSW#TR

• Resolution (bits): 12 b
• Sampling Rate (per Second): 50k
• Data Interface: Serial, Parallel
• Voltage Supply Source: Dual ±
• Voltage - Supply: ±5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1290
SNEAK-A-BIT Code for the LTC1290 Using the MC68HC05C4
TYPICAL
28
D
LOCATION $77
LOCATION $87
D
D
D
D
IN 1
IN 2
IN 3
OUT
IN
Words for LTC1290
from LTC1290 in MC68HC05C4 RAM
0
0
0
(ODD/SIGN)
MNEMONIC
LDA
STA
LDA
STA
BSET 0,$02
JSR
JSR
JSR
JSR
MUX Addr.
0
1
0
B12
Sign
B4
A
1
1
1
#$50
$0A
#$FF
$06
READ –/+ Dummy Read Configures LTC1290
READ –/+ Read CH6 with Respect to CH7
READ –/+ Read CH7 with Respect to CH6
CHK Sign
B11 B10
B3
PPLICATI
1
1
1
SNEAK-A-BIT Code
B2
UNI
1
1
1
Configuration Data for SPCR
Load Configuration Data into $0A
Configuration Data for Port C DDR
Load Configuration Data into Port C DDR
Make Sure CS is High
for next read
Determines which Reading has Valid Data,
Converts to 2’s Complement and
Stores in RAM
B9
B1
MSBF
1
1
1
LSB
B8
B0
O
1
1
1
Length
Word
DESCRIPTION
B7
Filled with 0s
U
1290 TA06
1
1
1
S
B6
B5
READ –/+:
READ +/–:
TRANSFER: BCLR 0,$02
LOOP 1:
LOOP 2:
CHK SIGN: LDA $73
MINUS:
END:
SNEAK-A-BIT Code for the LTC1290 Using the MC68HC05C4
MNEMONIC
LDA #$3F
JSR TRANSFER
LDA $60
STA $71
LDA $61
STA $72
RTS
LDA #$7F
JSR TRANSFER
LDA $60
STA $73
LDA $61
STA $74
RTS
STA $0C
TST
BPL LOOP 1
LDA $0C
STA $0C
STA $60
TST
BPL LOOP 2
BSET 0,$02
LDA $0C
STA $61
RTS
ORA $74
BEQ MINUS
CLC
ROR $73
ROR $74
LDA $73
STA $77
LDA $74
STA $87
BRA END
CLC
ROR $71
ROR $72
COM $71
COM $72
LDA $72
ADD #$01
STA $72
CLRA
ADC $71
STA $71
STA $77
LDA $72
STA $87
RTS
$0B
$0B
Load D
Load MSBs from LTC1290 into ACC
Store MSBs in $71
Load LSBs from LTC1290 into ACC
Store LSBs in $72
Return
Load D
Load MSBs from LTC1290 into ACC
Store MSBs in $73
Load LSBs from LTC1290 into ACC
Store LSBs in $74
Return
CS Goes Low
Load D
Test Status of SPIF
Loop to Previous Instruction if Not Done
Load Contents of SPI Data Reg. into ACC
Start Next Cycle
Store MSBs in $60
Test Status of SPIF
Loop to Previous Instruction if Not Done
CS Goes High
Load Contents of SPI Data Reg. into ACC
Store LSBs in $61
Return
Load MSBs of ± Read into ACC
Or ACC (MSBs) with LSBs of ± Read
Clear Carry
Rotate Right $73 Through Carry
Rotate Right $74 Through Carry
Load MSBs of ± Read into ACC
Store MSBs in RAM Location $77
Load LSBs of ± Read into ACC
Store LSBs in RAM Location $87
Go to End of Routine
Clear Carry
Shift MSBs of ± Read Right
Shift LSBs of ± Read Right
1’s Complement of MSBs
1’s Complement of LSBs
Load LSBs into ACC
Add 1 to LSBs
Store ACC in $72
Clear ACC
Add with Carry to MSBs. Result in ACC
Store ACC in $71
Store MSBs in RAM Location $77
Load LSBs in ACC
Store LSBs in RAM Location $87
Return
Read LTC1290 Routine
Read LTC1290 Routine
If Result is 0 Go to Minus
IN
IN
IN
Word for LTC1290 into ACC
Word for LTC1290 into ACC
into SPI, Start Transfer
DESCRIPTION
1290fe