LTC1291(RevA) 查看數據表（PDF） - Linear Technology
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LTC1291 Datasheet PDF : 20 Pages
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APPLICATI
S I FOR ATIO
Timing Diagram for Interface to the MC68HC11
CS
CLK
LTC1291
DIN
START
SGL/
DIFF
ODD/
EVEN
MSBF PS
DON'T CARE
DOUT
B11 B10 B9 B8
B7
B6 B5 B4 B3 B2 B1 B0
MPU
TRANSMIT
WORD
MPU
RECEIVED
WORD
0
0
0
0
0
0
1
SGL/
DIFF
BYTE 1
??
?
??
?
?
?
BYTE 1
ODD/
EVEN
MSBF
PS
X
X
X
X
X
BYTE 2
?
?
? 0 B11 B10 B9 B8
BYTE 2
X
X
X
X
X
X
X
X
BYTE 3 (DUMMY)
B7 B6 B5 B4 B3 B2 B1 B0
BYTE 3
LTC1291 AI06
Hardware and Software Interface to Motorola MC68HC11
DOUT FROM LTC1291 STORED IN MC68HC11 RAM
MSB
#62 0
0
0
0 B11 B10 B9 B8 BYTE 1
ANALOG
LSB
INPUTS
#63 B7 B6 B5 B4 B3 B2 B1 B0 BYTE 2
CH0
CS
CLK
LTC1291
DOUT
CH1
DIN
D0
SCK
MC68HC11
MISO
MOSI
LTC1291 AI07
MC68HC11 CODE
In this example the DIN word configures the input MUX for
a single-ended input to be applied to CH0. The conversion
result is output MSB-first.
LABEL MNEMONIC
LDAA
STAA
LDAA
STAA
LDAA
STAA
LDAA
STAA
OPERAND
#$50
$1028
#$1B
$1009
#$03
$50
#$60
$51
COMMENTS
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
LABEL MNEMONIC
LDAA
STAA
LDX
LOOP BCLR
LDAA
STAA
OPERAND
#$00
$52
#$1000
$08,X,#$01
$50
$102A
COMMENTS
LOAD DUMMY DIN WORD INTO
ACC A
LOAD DUMMY DIN DATA INTO $52
LOAD INDEX REGISTER X WITH
$1000
D0 GOES LOW (CS GOES LOW)
LOAD DIN INTO ACC A FROM $50
LOAD DIN INTO SPI, START SCK
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11
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