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ADC0832 Datasheet(PDF) 20 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # ADC0832
Description  8-Bit Serial I/O A/D Converters with Multiplexer Options
PDF  33 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0832 Datasheet(HTML) 20 Page - National Semiconductor (TI)

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Applications (Continued)
Cop Coding Example
Mnemonic
Instruction
LEI
ENABLES SIO’s INPUT AND OUTPUT
SC
C=1
OGI
G0=0 (CS =0)
CLR A
CLEARS ACCUMULATOR
AISC 1
LOADS ACCUMULATOR WITH 1
XAS
EXCHANGES SIO WITH ACCUMULATOR
AND STARTS SK CLOCK
LDD
LOADS MUX ADDRESS FROM RAM
INTO ACCUMULATOR
NOP
—
XAS
LOADS MUX ADDRESS FROM
ACCUMULATOR TO SIO REGISTER
↑
8 INSTRUCTIONS
↓
XAS
READS HIGH ORDER NIBBLE (4 BITS)
INTO ACCUMULATOR
XIS
PUTS HIGH ORDER NIBBLE INTO RAM
CLR A
CLEARS ACCUMULATOR
RC
C=0
XAS
READS LOW ORDER NIBBLE INTO
ACCUMULATOR AND STOPS SK
XIS
PUTS LOW ORDER NIBBLE INTO RAM
OGI
G0=1 (CS =1)
LEI
DISABLES SIO’s INPUT AND OUTPUT
8048 CODING EXAMPLE
Mnemonic
Instruction
START:
ANL
P1, #0F7H ;SELECT A/D (CS =0)
MOV
B, #5
;BIT COUNTER
←5
MOV
A, #ADDR
;A
←MUX ADDRESS
LOOP 1:
RRC
A
;CY
←ADDRESS BIT
JC
ONE
;TEST BIT
;BIT=0
ZERO:
ANL
P1, #0FEH ;DI
←0
JMP
CONT
;CONTINUE
;BIT=1
ONE:
ORL
P1, #1
;DI
←1
CONT:
CALL
PULSE
;PULSE SK 0
→1→0
DJNZ
B, LOOP 1 ;CONTINUE UNTIL
DONE
CALL
PULSE
;EXTRA CLOCK FOR
SYNC
MOV
B, #8
;BIT COUNTER
←8
LOOP 2:
CALL
PULSE
;PULSE SK 0
→1→0
IN
A, P1
;CY
←DO
RRC
A
RRC
A
MOV
A, C
;A
←RESULT
RLC
A
;A(0)
←BIT AND SHIFT
MOV
C, A
;C
←RESULT
DJNZ
B, LOOP 2 ;CONTINUE UNTIL
DONE
RETR
;PULSE SUBROUTINE
PULSE:
ORL
P1, #04
;SK
←1
NOP
;DELAY
ANL
P1, #0FBH ;SK
←0
RET
www.national.com
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