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PSD4135F1-90U Datasheet(PDF) 39 Page - STMicroelectronics |
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PSD4135F1-90U Datasheet(HTML) 39 Page - STMicroelectronics |
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39 / 93 page  MCU CNTL0 CNTL1 CNTL2 PD3 PD0** ADIO0 PF3-PF0 68302, 68306 R/W LDS UDS * AS – * MMC2001 68330, 68331 R/W DS SIZ0 * AS A0 * 68332, 68340 68LC302, WEL OE WEH AS – * MMC2001 68HC16 R/W DS SIZ0 * AS A0 * 68HC912 R/W E LSTRB DBE E A0 * 68HC812*** R/W E LSTRB ** A0 * 80196 WR RD BHE * ALE A0 * 80196SP WRL RD * WRH ALE A0 * 80186 WR RD BHE * ALE A0 * 80C161 80C164-80C167 WR RD BHE * ALE A0 * 80C51XA WRL RD PSEN WRH ALE A4/D0 A3-A1 H8/3044 WRL RD * WRH AS A0 – M37702M2 R/W E BHE * ALE A0 * PSD4000 Series Preliminary Information 36 The PSD4000 Functional Blocks (cont.) 9.3 Microcontroller Bus Interface The “no-glue logic” PSD4000 Microcontroller Bus Interface can be directly connected to most popular microcontrollers and their control signals. Key 16-bit microcontrollers with their bus types and control signals are shown in Table 14. The MCU interface type is specified using the PSDsoft. Table 14. Microcontrollers and their Control Signals ***Unused CNTL2 pin can be configured as GPLD input. Other unused pins (PD3-0, PF3-0) can be ***configured for other I/O functions. ***ALE/AS input is optional for microcontrollers with a non-multiplexed bus. ***This configuration is for 68C812A4_EC at 5MHz, 3V only. 9.3.1. PSD4000 Interface to a Multiplexed Bus Figure 16 shows an example of a system using a microcontroller with a 16-bit multiplexed bus and a PSD4000. The ADIO port on the PSD4000 is connected directly to the microcontroller address/data bus. ALE latches the address lines internally. Latched addresses can be brought out to Port E, F or G. The PSD4000 drives the ADIO data bus only when one of its internal resources is accessed and the RD input is active. Should the system address bus exceed sixteen bits, Ports A, B, C, or F may be used as additional address inputs. 9.3.2. PSD4000 Interface to a Non-Multiplexed Bus Figure 17 shows an example of a system using a microcontroller with a 16-bit non-multiplexed bus and a PSD4000. The address bus is connected to the ADIO Port, and the data bus is connected to Port F and G. Port F and G are in tri-state mode when the PSD4000 is not accessed by the microcontroller. Should the system address bus exceed sixteen bits, Ports A, B or C may be used for additional address inputs. |
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