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AD7827BN Folha de dados(PDF) 11 Page - Analog Devices |
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AD7827BN Folha de dados(HTML) 11 Page - Analog Devices |
11 / 12 page AD7827 –11– REV. 0 MICROPROCESSOR INTERFACING The Serial Interface on the AD7827 allows the part to be con- nected directly to a range of many different microprocessors and microcontrollers. This section explains how to interface the AD7827 with some of the more common DSP serial interface protocols. AD7827 to TMS320C5x The serial interface on the TMS320C5x uses a continuous serial clock and frame synchronization signals to synchronize the data transfer operations with peripheral devices such as the AD7827. A receive frame synchronization output has been supplied on the AD7827 to allow easy interfacing with no extra gluing logic. The serial port of the TMS320C5x is set up to operate in Burst Mode with internal CLKX (TX serial clock) and FSR (RX frame sync). The Serial Port Control register (SPC) must have the following setup: F0 = 1, FSM = 1, MCM = 1. The connec- tion diagram is shown in Figure 16. TMS320C5x* CLKX CLKR DR FSR AD7827* SCLK DOUT RFS *ADDITIONAL PINS OMITTED FOR CLARITY Figure 16. Interfacing to the TMS320C5x AD7827 to ADSP-21xx The ADSP-21xx family of DSPs are easily interfaced to the AD7827 without the need for any extra gluing logic. The SPORT is operated in alternate framing mode. The SPORT control register should be set up as follows: TFSW = RFSW = 1, Alternate Framing INVRFS = INVTFS = 1, Active Low Frame Signal DTYPE = 00, Right Justify Data SLEN = 0111, 8-Bit Data Words ISCLK = 1, Internal Serial Clock TFSR = RFSR = 1, Frame Every Word IRFS = 0, External Framing Signal ITFS = 1, Internal Framing Signal The 8-bit data words will be right justified in the 16-bit serial data registers when using this configuration. Figure 17 shows the connection diagram. ADSP-21xx* DR AD7827* SCLK DOUT RFS RFS SCLK *ADDITIONAL PINS OMITTED FOR CLARITY Figure 17. Interfacing to the ADSP-21xx AD7827 to DSP56xxx The connection diagram in Figure 18 shows how the AD7827 can be connected to the SSI (Synchronous Serial Interface) of the DSP56xxx family of DSPs from Motorola. The SSI is oper- ated in Synchronous Mode (SYN bit in CRB = 1) with inter- nally generated 1-bit clock period frame sync for both TX and RX (FSL1 and FSL0 bits in CRB = 1 and 0 respectively). DSP56xxx* SRD AD7827* SCLK DOUT SC2 RFS SCLK *ADDITIONAL PINS OMITTED FOR CLARITY Figure 18. Interfacing to the DSP56xxx Microcontrollers The AD7827 may also be interfaced to many microcontrollers, as a continuous serial clock is not essential. However, enough time must be left for the conversion to be complete before applying a burst of serial clocks to read out the data. |
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