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PSD835G2 Scheda tecnica(PDF) 51 Page - STMicroelectronics |
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PSD835G2 Scheda tecnica(HTML) 51 Page - STMicroelectronics |
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51 / 102 page  51/102 PSD835G2 PSD Interface to a Multiplexed 8-Bit Bus Figure 20 shows an example of a system using a MCU with an 8-bit multiplexed bus and a PSD. The ADIO port on the PSD is connected directly to the MCU address/data bus. Address Strobe (ALE/AS, PD0) latches the address signals internally. Latched addresses can be brought out to Port E, For G. The PSD drives the ADIO data bus only when one of its internal resources is accessed and Read Strobe (RD, CNTL1) is active. Should the system address bus exceed sixteen bits, Ports A, B, C, or F may be used as additional address in- puts. Figure 20. An Example of a Typical 8-bit Multiplexed Bus Interface MCU WR RD BHE ALE RESET AD7-AD0 A15-A8 A15-A8 A7-A0 ADIO PORT PORT F PORT G PORT A, B or C WR (CNTRL0) RD (CNTRL1) BHE (CNTRL2) RST ALE (PD0) PORT D (OPTIONAL) (OPTIONAL) PSD AI02878D A23-A16 (OPTIONAL) |
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