ROM and RAM Emulator for 8051

  
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If the green LED is on, the slave MCU is enabled. The MAX690 keeps the memory contents during power off. No resouces of the slave MCU are used. Wenn a SAB-C515 is used, it is possible to develop programs for the AT89-family easily by changing simply the port addresses. Remember that the address of the interrupt priority register at the 8051 is at the SAB-C515 the
ROM and RAM Emulator for 8051 - schematic

second interrupt enable register! Be careful also when you use the T2 of SAB-C515, compared to 8052 it is extended to a compare and capture unit. Do not ever write any 1`s to bits that are not used by the basic 8051 architecture.



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