LTC1291 Linear Technology, LTC1291 Datasheet - Page 11

• Manufacturer Part Number: LTC1291
• Description: Single Chip 12-Bit Data Acquisition System
• Manufacturer: Linear Technology

TRANSMIT
MC68HC11 CODE
In this example the D
a single-ended input to be applied to CH0. The conversion
result is output MSB-first.
LABEL MNEMONIC
A
RECEIVED
WORD
WORD
PPLICATI
D
MPU
MPU
CLK
OUT
D
CS
IN
LDAA
STAA
LDAA
STAA
LDAA
STAA
LDAA
STAA
0
?
0
?
#62
O
#63
0
?
OPERAND
#$50
$1028
#$1B
$1009
#$03
$50
#$60
$51
U
IN
MSB
D OUT FROM LTC1291 STORED IN MC68HC11 RAM
0
?
B7
0
BYTE 1
BYTE 1
S
word configures the input MUX for
?
0
I FOR ATIO
B6
0
U
CONFIGURATION DATA FOR SPCR
LOAD DATA INTO SPCR ($1028)
CONFIG. DATA FOR PORT D DDR
LOAD DATA INTO PORT D DDR
LOAD DIN WORD INTO ACC A
LOAD DIN DATA INTO $50
LOAD DIN WORD INTO ACC A
LOAD DIN DATA INTO $51
COMMENTS
?
0
B5
0
START
?
1
Hardware and Software Interface to Motorola MC68HC11
LSB
B4
0
W
SGL/
SGL/
DIFF
DIFF
?
Timing Diagram for Interface to the MC68HC11
B11
B3
EVEN
ODD/
B10
B2
ODD/
EVEN MSBF
?
B9
B1
U
MSBF
?
B8
B0
PS
PS
?
BYTE 1
BYTE 2
X
0
BYTE 2
BYTE 2
LABEL MNEMONIC
LOOP
B11
B11
X
ANALOG
INPUTS
B10
B10
X
LDAA
STAA
LDX
BCLR
LDAA
STAA
B9
B9
X
B8
B8
X
CH0
CH1
LTC1291
OPERAND
B7
#$00
$52
#$1000
$08,X,#$01 D0 GOES LOW (CS GOES LOW)
$50
$102A
D
CLK
OUT
D
B7
X
CS
IN
DON'T CARE
B6
B6
X
B5
B5
COMMENTS
X
LOAD DUMMY DIN WORD INTO
ACC A
LOAD DUMMY DIN DATA INTO $52
LOAD INDEX REGISTER X WITH
$1000
LOAD DIN INTO ACC A FROM $50
LOAD DIN INTO SPI, START SCK
BYTE 3 (DUMMY)
B4
B4
X
BYTE 3
D0
SCK
MISO
MOSI
MC68HC11
B3
B3
X
LTC1291 AI07
B2
B2
X
LTC1291
B1
B1
X
B0
B0
X
11
LTC1291 AI06