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PSD813F1A データシート(PDF) 45 Page - STMicroelectronics |
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PSD813F1A データシート(HTML) 45 Page - STMicroelectronics |
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45 / 111 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) 45/111 PSD813F1A PSD Interface to a Multiplexed 8-Bit Bus Figure 21 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 21. 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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