ROM and RAM Emulator for 8051

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

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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