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EPROM

The MCBx51 board comes with a Monitor EPROM (IC13) which supports up to 16 different Monitor versions. You may replace the EPROM with a 27C1001 or 27C2001 for your target program.

If you insert an EPROM with a user application program, the DIP switches PAGE, SCR/D2, 51/151, and Monitor, must be set to OFF. If the Monitor DIP switch is OFF, you may select different memory maps for the user application using the MAP0 and MAP1 DIP switches. For more information, refer to the MAP1 and MAP0 DIP switches descriptions.

The following table lists the Monitor EPROM addresses for the different monitor versions, and contains the EPROM addresses of the 251/151 configuration bytes CONFIG0 and CONFIG1. The Monitor EPROM contains a LJMP 0E800H instruction at address 0 and address 10000H.

Monitor Version
EPROM Addresses
Monitor Program Code CONFIG0 CONFIG1
8051/151 Monitor, PAGE Mode with Flash LEDs 00800H-01FFFH 01FF8H 01FF9H
251 Monitor, Source Mode, PAGE, with Flash LEDs 02800H-03FFFH 03FF8H 03FF9H
8xC51Rx+/8xC51Rx2 Monitor with Flash LEDs 04800H-05FFFH - -
251 Monitor, BINARY Mode, PAGE, with Flash LEDs 06800H-07FFFH 07FF8H 07FF9H
Dallas 320/420/520 Version with Flash LEDs 08800H-09FFFH - -
251 Monitor, Source Mode, NOPAGE, with Flash LEDs 0A800H-0BFFFH 0BFF8H 0BFF9H
8051/151 Monitor, NOPAGE, with Flash LEDs 0C800H-0DFFFH 0DFF8H 0DFF9H
251 Monitor, BINARY Mode, NOPAGE, with Flash LEDs 0E800H-0FFFFH 0FFF8H 0FFF9H
8051/151 Monitor, PAGE Mode, no Flash LEDs 10800H-11FFFH 11FF8H 11FF9H
251 Monitor, Source Mode, PAGE, no Flash LEDs 12800H-13FFFH 13FF8H 13FF9H
8xC51Rx+/8xC51Rx2 Monitor, no Flash LEDs 14800H-15FFFH - -
251 Monitor, Binary Mode, PAGE, no Flash LEDs 16800H-17FFFH 17FF8H 17FF9H
Dallas 320/420/520 Version, no Flash LEDs 18800H-19FFFH - -
251 Monitor, Source Mode, NOPAGE, no Flash LEDs 1A800H-1BFFFH 1BFF8H 1BFF9H
8051/151 Monitor, NOPAGE, no Flash LEDs 1C800H-1DFFFH 1DFF8H 1DFF9H
251 Monitor, Binary Mode, NOPAGE, no Flash LEDs 1E800H-1FFFFH 1FFF8H 1FFF9H
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