LTC1199 LINER [Linear Technology], LTC1199 Datasheet - Page 22

• Manufacturer Part Number: LTC1199
• Description: 10-Bit, 500ksps ADCs in MSOP with Auto Shutdown
• Manufacturer: LINER [Linear Technology]

LTC1197/LTC1197L
LTC1199/LTC1199L
22
TYPICAL
ANALOG
INPUTS
LOCATION A + 1
Hardware and Software Interface to Motorola MC68HC05C4
LOCATION A
MPU TRANSMIT
MPU RECEIVED
D
OUT
WORD
WORD
B7
0
LTC1199
D
A
CLK
from LTC1199 Stored in MC68HC05C4
OUT
D
CS
IN
PPLICATI
B6
0
D
CLK
OUT
B5
D
CS
0
IN
B4
0
START
BIT
START
1
?
B3
0
O
SGL/
DIFF
SGL/
?
DIFF
B2
U
0
SCK
MISO
MOSI
C0
ODD/
SIGN
Data Exchange Between LTC1199 and MC68HC05C4
S
MC68HC05C4
ODD/
SIGN
?
MSB
B9
B1
1ST TRANSFER
DUMMY
DUMMY
1197/99 TA05
?
BYTE 1
1197/99 TA04
B8
B0
LSB
X
0
BYTE 1
BYTE 2
B9
X
0
B8
B9
X
B8
X
B7
LABEL
START
B6
X
B7
DON‘T CARE
MNEMONIC
BCLRn
STA
AND
LDA
STA
TST
BPL
LDA
STA
TST
BPL
BSETn
LDA
STA
B5
B6
X
B4
B5
X
BYTE 2 (DUMMY)
X = DON‘T CARE
2ND TRANSFER
B3
B4
X
B2
Bit 0 Port C goes low (CS goes low)
Load LTC1199 D
Load LTC1199 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 6 MSBs of 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)
B3
X
B1
B2
X
OUT
B0
OUT
LSBs)
B1
X
MSBs)
IN
IN
COMMENTS
B0
X
word into ACC
word into SPI from ACC
OUT
1197/99 TA03
word