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AD7840KP Datasheet(PDF) 10 Page - Analog Devices |
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AD7840KP Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page AD7840 REV. B –10– MICROPROCESSOR INTERFACING The AD7840 logic architecture allows two interfacing options for interfacing the part to microprocessor systems. It offers a 14-bit wide parallel format and a serial format. Fast pulse widths and data setup times allow the AD7840 to interface directly to most microprocessors including the DSP processors. Suitable interfaces to various microprocessors are shown in Figures 15 to 23. Parallel Interfacing Figures 15 to 17 show interfaces to the DSP processors, the ADSP-2100, the TMS32010 and TMS32020. An external timer controls the updating of the AD7840. Data is loaded to the AD7840 input latch using the following instructions: ADSP-2100: DM(DAC) = MR0 TMS32010: OUT DAC,D TMS32020: OUT DAC,D MR0 = ADSP-2100 MR0 Register D = Data Memory Address DAC = AD7840 Address Figure 15. AD7840–ADSP-2100 Parallel Interface Figure 16. AD7840–TMS32010 Parallel Interface Figure 17. AD7840–TMS32020 Parallel Interface Some applications may require that the updating of the AD7840 DAC latch be controlled by the microprocessor rather than the external timer. One option (for double-buffered interfacing) is to decode the AD7840 LDAC from the address bus so that a write operation to the DAC latch (at a separate address than the input latch) updates the output. An example of this is shown in the 8086 interface of Figure 18. Note that connecting the LDAC input to the CS input will not load the DAC latch cor- rectly since both latches cannot he transparent at the same time. AD7840–8086 Interface Figure 18 shows an interface between the AD7840 and the 8086 microprocessor. For this interface, the LDAC input is derived from a decoded address. If the least significant address line, A0, is decoded then the input latch and the DAC latch can reside at consecutive addresses. A move instruction loads the input latch while a second move instruction updates the DAC latch and the AD7840 output. The move instruction to load a data word WXYZ to the input latch is as follows: MOV DAC,#YZWX DAC = AD7840 Address Figure 18. AD7840–8086 Parallel Interface |
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