LTC1096 Linear Technology, LTC1096 Datasheet - Page 23

• Manufacturer Part Number: LTC1096
• Description: Micropower Sampling 8-Bit Serial I/O A/D Converters
• Manufacturer: Linear Technology

TYPICAL
Hardware and Software Interface to Motorola MC68HC05C4
ANALOG
INPUTS
LOCATION A + 1
LOCATION A
MPU TRANSMIT
D
MPU RECEIVED
OUT
from LTC1098(L) Stored in MC68HC05C4
A
WORD
WORD
D
CLK
OUT
D
PPLICATI
CS
LTC1098
B7
IN
0
B6
0
D
CLK
OUT
D
CS
B5
0
IN
B4
0
?
0
O
B3
0
?
0
U
Data Exchange Between LTC1098(L) and MC68HC05C4
S
B2
0
0
?
1ST TRANSFER
SCK
MISO
MOSI
C0
START
START
MC68HC05C4
BIT
B1
0
1
?
LTC1096/8 • TA05
LTC1096/8 • TA04
SGL/
SGL/
DIFF
DIFF
B0
LSB
0
?
ODD/
SIGN
ODD/
SIGN
BYTE 1
BYTE 2
?
BYTE 1
MSBF
MSBF
?
X
0
LABEL
START
X
B7
B7
MNEMONIC
BCLRn
STA
AND
STA
LDA
STA
TST
BPL
LDA
STA
TST
BPL
BSETn
LDA
B6
B6
X
DON'T CARE
B5
B5
X
BYTE 2 (DUMMY)
X = DON'T CARE
2ND TRANSFER
B4
B4
X
B3
LTC1096/LTC1096L
LTC1098/LTC1098L
B3
X
Bit 0 Port C goes low (CS goes low)
Load LTC1098(L) D
Load LTC1098(L) D
Transfer begins.
Test status of SPIF
Loop to previous instruction if not done
with transfer
Load contents of SPI data register
into Acc. (D
Start next SPI cycle
Clear the first D
Store in memory location A (MSBs)
Test status of SPIF
Loop to previous instruction if not done
with transfer
Set B0 of Port C (CS goes high)
Load contents of SPI data register into
Acc. (D
Store in memory location A + 1 (LSBs)
B2
B2
X
OUT
B1
B1
X
LSBs)
OUT
B0
B0
X
OUT
MSBs)
COMMENTS
IN
IN
word
word into Acc.
word into SPI from Acc.
LTC1096/8 • TA03
23