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AD7707 Datasheet(PDF) 41 Page - Analog Devices |
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AD7707 Datasheet(HTML) 41 Page - Analog Devices |
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41 / 53 page  AD7707 Rev. B | Page 40 of 52 AD7707 TO 8XC51 INTERFACE An interface circuit between the AD7707 and the 8XC51 microcontroller is shown in Figure 24. The diagram shows the minimum number of interface connections with CS on the AD7707 hard-wired low. In the case of the 8XC51 interface, the minimum number of interconnects is just two. In this scheme, the DRDY bit of the communications register is monitored to determine when the data register is updated. The alternative scheme, which increases the number of interface lines to three, is to monitor the DRDY output line from the AD7707. The monitoring of the DRDY line can be done in two ways. First, DRDY can be connected to one of the 8XC51’s port bits (such as P1.0), which is configured as an input. This port bit is then polled to determine the status of DRDY. The second scheme is to use an interrupt-driven system, in which case the DRDY output is connected to the INT1 input of the 8XC51. For interfaces that require control of the CS input on the AD7707, one of the port bits of the 8XC51 (such as P1.1), which is configured as an output, can be used to drive the CS input. The 8XC51 is configured in its Mode 0 serial interface mode. Its serial interface contains a single data line. As a result, the DATA OUT and DATA IN pins of the AD7707 should be connected together with a 10 kΩ pull- up resistor. The serial clock on the 8XC51 idles high between data transfers. The 8XC51 outputs the LSB first in a write operation; however, the AD7707 expects the MSB first so the data to be transmitted must be rearranged before being written to the output serial register. Similarly, the AD7707 outputs the MSB first during a read operation; however, the 8XC51 expects the LSB first. Therefore, the data read into the serial buffer must be rearranged before the correct data word from the AD7707 is available in the accumulator. P3.0 P3.1 8XC51 RESET SCLK DOUT DIN CS AD7707 VDD VDD Figure 24. AD7707-to-8XC51 Interface |
Similar Part No. - AD7707_17 |
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Similar Description - AD7707_17 |
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