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AD573JP データシート(PDF) 8 Page - Analog Devices |
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AD573JP データシート(HTML) 8 Page - Analog Devices |
8 / 8 page AD573 REV. A –8– It is also possible to write a faster-executing assembly-language routine to control the AD573. Such a routine will require a de- lay between starting and reading the converter. This can be eas- ily implemented by calling the Apple’s WAIT subroutine (which resides at location $FCA8) after loading the accumulator with a number greater than or equal to two. 8085-Series Microprocessor Interface The AD573 can also be used with 8085-series microprocessors. These processors use separate control signals for RD and WR, as opposed to the single R/W control signal used in the 6800/ 6500 series processors. There are two constraints related to operation of the AD573 with 8085-series processors. The first problem is the width of the CONVERT pulse. The circuit shown in Figure 17 (essen- tially the same as that shown in Figure 13) will produce a wide enough CONVERT pulse when the 8085 is running at 5 MHz. For 8085 systems running at slower clock rates (3 MHz), the flip-flop-based circuit can be eliminated since the WR pulse will be approximately 500 ns wide. The other consideration is the access time of the AD573’s three- state output data buffers, which is 250 ns maximum. It may be necessary to insert wait states during RD operations from the AD573. This will not be a problem in systems using memories with comparable access times, since wait states will have already been provided in the basic system design. Figure 17. AD573–8085A Interface Connections The following assembly-language subroutine can be used to control an AD573 residing at memory locations 3000H and 3001H. The 10 bits of data are returned (left-justified) in the DE register pair. ADC: LXI H, 3000 ; LOAD HL WITH AD573 ADDRESS MOV M, A ; START CONVERSION MVI B, 06 ; LOAD DELAY PERIOD LOOP: DCR B ; DELAY LOOP JNZ LOOP ; MOV A, M ; READ LOW BYTE ANI C0 ; MASK LOWER 6 BITS MOV E, A ; STORE CLEAN LOW BYTE IN E INR L ; LOAD HIGH BYTE ADDRESS MOV D, M ; MOVE HIGH BYTE TO D RET ; EXIT OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 20-Pin Ceramic DIP Package (“D”) 20-Pin Plastic DIP Package (“N”) P-20A PLCC |
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