Mnemonic Operation MOVC A, A+DPTR Copy the contents of the external ROM address formed by adding A and the DPTR, to A MOVC A, A + PC This operation will do copy This operation contents of the external ROM address formed by adding A and the PC, to A. This table is explaining the instructions to access external ROM/program memory. Instructions to Access External ROM / Program Memory : If the interrupt isn’t used, the service location may be used as general-purpose program memory. If an interrupt is to be used, the operation routine for it must be in the same place as the interrupt.
Port 0 is used as a multiplexed address/bus, as seen in Fig2.1, the PSEN signal is used to trigger output e external ROM/EPROM. ROM/EPROM that is external to the device.When the EA pin is grounded, all addresses fetched by the program (0000H to FFFFH) are led to it. The program fetches to addresses 0000H through OFFFH are directed to the internal ROM in the 8051 when the EA pin is attached to Vec, and program fetches to addresses 1000H through FFFFH are directed to the external ROM/EPROM.Let’s take a look at how the 8051 accesses these memories. We also understand that ROM serves as program memory and RAM serves as data memory. To expand the memory space of the 8051 micro-controller, we must bind external ROM/EPROM and RAM. For certain applications, this memory capacity will not be adequate.
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