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ADC0844 Просмотр технического описания (PDF) - National ->Texas Instruments

Номер в каталогеADC0844 National-Semiconductor
National ->Texas Instruments National-Semiconductor
Компоненты Описание8-Bit μP Compatible A/D Converters with Multiplexer Options
ADC0844 Datasheet PDF : 24 Pages
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I/O Interface to NSC800
501628
0008
000F
001F
3C00
0000
0004
0008
000A
000C
000F
0012
08 09 0A 0B
0C 0D 0E 0F
0E 1F
06 16
21 0000
11 003C
ED A3
0014EB
0015
0017
0018
001B
3E 0F
3D
C2 0013
ED A2
001DEB
001EC2 000E
SAMPLE PROGRAM FOR ADC0848—NSC800 INTERFACE
NCONV
DEL
CS
ADDTA
MUXDTA:
START:
STCONV:
WAIT:
EQU
EQU
EQU
EQU
DB
DB
LD
LD
LD
LD
OUTI
EX
LD
DEC
JP
INI
EX
JP
16
15
1FH
003CH
08H,09H,0AH,0BH
0CH,0DH,0EH,0FH
C,CS
B,NCONV
HL,MUXDTA
DE,ADDTA
DE,HL
A,DEL
A
NZ,WAIT
DE,HL
NZ,STCONV
;DELAY 50 μsec CONVERSION
;THE BOARD ADDRESS
;START OF RAM FOR A/D
;DATA
;MUX DATA
;LOAD A/D'S MUX DATA
;AND START A CONVERSION
;HL=RAM ADDRESS FOR THE
;A/D DATA
;WAIT 50 μsec FOR THE
;CONVERSION TO FINISH
;STORE THE A/D'S DATA
;CONVERTED ALL INPUTS?
;IF NOT GOTO STCONV
END
Note 15: This routine sequentially programs the MUX data latch in the signal-ended mode. For CH1-CH8 a conversion is started, then a 50 μs wait for the A/D
to complete a conversion and the data is stored at address ADDTA for CH1, ADDTA + 1 for CH2, etc.
19
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