Rainbow Electronics ADC0848 - Manual (Page 16)

Applications Information
(Continued)
I O Interface to NSC800
TL H 5016 – 28
SAMPLE PROGRAM FOR ADC0848 NSC800 INTERFACE
0008 NCONV EQU 16
000F DEL EQU 15 DELAY 50 msec CONVERSION
001F CS EQU 1FH THE BOARD ADDRESS
3C00 ADDTA EQU 003CH START OF RAM FOR A D
DATA
0000 08 09 0A 0B MUXDTA DB 08H 09H 0AH 0BH MUX DATA
0004 0C 0D 0E 0F DB 0CH 0DH 0EH 0FH
0008 0E 1F START LD C CS
000A 06 16 LD B NCONV
000C 21 0000 LD HL MUXDTA
000F 11 003C LD DE ADDTA
0012 ED A3 STCONV OUTI LOAD A D’S MUX DATA
AND START A CONVERSION
0014 EB EX DE HL HLeRAM ADDRESS FOR THE
A D DATA
0015 3E 0F LD A DEL
0017 3D WAIT DEC A WAIT 50 msec FOR THE
0018 C2 0013 JP NZ WAIT CONVERSION TO FINISH
001B ED A2 INI STORE THE A D’S DATA
CONVERTED ALL INPUTS
001D EB EX DE HL
001E C2 000E JP NZ STCONV IF NOT GOTO STCONV
END
Note This routine sequentially programs the MUX data latch in the signal-ended mode For CH1-CH8 a conversion is started then a 50 ms wait for the A D to
complete a conversion and the data is stored at address ADDTA for CH1 ADDTA a 1 for CH2 etc
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