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Technical Support
On-Line Manuals
MCBx51 User's Guide
Introduction
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Theory of Operation
Block Diagram
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EPROM
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Address Decoding
251 Devices
8051 Devices
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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