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PSD813F2 Datasheet(PDF) 44 Page - STMicroelectronics |
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PSD813F2 Datasheet(HTML) 44 Page - STMicroelectronics |
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44 / 110 page  PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2 44/110 PSD Interface to a Multiplexed 8-Bit Bus Figure 19 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 A or B. 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 D may be used as additional address inputs. Figure 19. An Example of a Typical 8-bit Multiplexed Bus Interface MCU WR RD BHE ALE RESET AD [ 7:0] A[ 15:8] A[ 15: 8] A[ 7: 0] ADIO PORT PORT A PORT B PORT C WR (CNTRL0) RD (CNTRL1) BHE (CNTRL2) RST ALE (PD0) PORT D (OPTIONAL) (OPTIONAL) PSD AI02878C |
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