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12-Bit Serial Daisy-Chain D/A Converter

8143

07.23.03 REV 3

Interface to the 8085

The 8143’s interface to the 8085 microprocessor is shown in Figure 22. Note that the microprocessor’s SOD line is

used to present data serially to the DAC.

Data is strobed into the 8143 by executing memory write instructions. The strobe 2 input is generated by decoding an

address location and WR. Data is loaded into the DAC register with a memory write instruction to another address

location.

Serial data supplied to the 8143 must be present in the right-justified format in registers H and L of the microprocessor.

Interface to the 68000

Figure 23 shows the 8143 configured to the 68000 microprocessor. Serial data input is similar to that of the 6800 in

Figure 21.