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AD7845SE Datasheet(PDF) 10 Page - Analog Devices |
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AD7845SE Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page AD7845 REV. B –10– 8-BIT MICROPROCESSOR SYSTEMS Figure 22 shows an interface circuit for the AD7845 to the 8085A 8-bit microprocessor. The software routine to load data to the device is given in Table IV. Note that the transfer of the 12 bits of data requires two write operations. The first of these loads the 4 MSBs into the 7475 latch. The second write opera- tion loads the 8 LSBs plus the 4 MSBs (which are held by the latch) into the DAC. Figure 22. 8085A Interface Table IV. Subroutine Listing for Figure 22 2000 LOAD DAC: LXI H,#3000 The H,L register pair are loaded with latch address 3000. MVI A,#“MS” Load the 4 MSBs of data into accumulator. MOV M,A Transfer data from accumulator to latch. INR L Increment H,L pair to AD7845 address. MVI A,#“LS” Load the 8 LSBs of data into accumulator. MOV M,A Transfer data from accumulator to DAC. RET End of routine. MICROPROCESSOR INTERFACING 16-BIT MICROPROCESSOR SYSTEMS Figures 19, 20 and 21 show how the AD7845 interfaces to three popular 16-bit microprocessor systems. These are the MC68000, 8086 and the TM32010. The AD7845 is treated as a memory-mapped peripheral to the processors. In each case, a write instruction loads the AD7845 with the appropriate data. The particular instructions used are as follows: MC68000: MOVE 8086: MOV TMS32010: OUT Figure 19. AD7845 to MC68000 Interface Figure 20. AD7845 to 8086 Interface Figure 21. TMS32010 |
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