C8051FC40 expansion PM23L08 expansion circuit

C8051FC40 expansion PM23L08 expansion circuit

There are already mature examples of single-chip microcomputer expansion of serial ports, which will not be listed in this article. The following is only the schematic diagram of single-chip microcomputer controlling FRAM. In this system, the address signal multiplexing mode is adopted, so that the ALE signal can be generated. FM20LO8 has its own latch, and the chip select signal CE cannot be directly grounded like SRAM, and a pre-charge time is required. This signal is generated by HC04 and HC32. In addition, the address signal needs to be latched on its falling edge. The specific expansion is shown in Figure 2.