Rainbow Electronics АDC0805 - Manual (Page 21)

Functional Description
(Continued)
TL H 5671 – 20
Note 1 Pin numbers for the DP8228 system controller others are INS8080A
Note 2 Pin 23 of the INS8228 must be tied to a 12V through a 1 kX resistor to generate the RST 7
instruction when an interrupt is acknowledged as required by the accompanying sample program
FIGURE 10 ADC0801 – INS8080A CPU Interface
SAMPLE PROGRAM FOR FIGURE 10 ADC0801 – INS8080A CPU INTERFACE
0038 C3 00 03 RST 7 JMP LD DATA
0100 21 00 02 START LXI H 0200H HL pair will point to
data storage locations
0103 31 00 04 RETURN LXI SP 0400H Initialize stack pointer (Note 1)
0106 7D MOV A L Test of bytes entered
0107 FE OF CPI OF H If 4 16 JMP to
0109 CA 13 01 JZ CONT user program
010C D3 E0 OUT E0 H Start A D
010E FB EI Enable interrupt
010F 00 LOOP NOP Loop until end of
0110 C3 OF 01 JMP LOOP conversion
0113 CONT
(User program to
process data)
0300 DB E0 LD DATA IN E0 H Load data into accumulator
0302 77 MOV M A Store data
0303 23 INX H Increment storage pointer
0304 C3 03 01 JMP RETURN
Note 1 The stack pointer must be dimensioned because a RST 7 instruction pushes the PC onto the stack
Note 2 All address used were arbitrarily chosen
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