Keil MCB251, Руководство пользователя

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MCB251 Evaluation Board User’s Guide 7
PAGE: Default OFF
The PAGE switch selects whether or not the 251 or 151 Monitor operates in
page mode or non-page mode. When PAGE is ON, a page mode Monitor
version is selected. When PAGE is OFF, a non-page mode Monitor version is
enabled. For correct operation of the MCB251 board, you must also set the
configuration jumpers to the correct position: PAGE for page mode or NONP
for non-page mode.
If you operate the MCB251 with a user application in EPROM, you must set the
PAGE switch OFF. However, you may still use the jumpers to select page mode
or non-page mode.
Monitor: Default ON
The Monitor switch selects if the Monitor is used for debugging or if the
MCB251 operates with a user application EPROM at IC13. When Monitor is
ON, the Monitor Memory Mapping is enabled and you must operate the
MCB251 board with the supplied Monitor EPROM. When Monitor is OFF, the
User Memory Mapping is selected and you may insert an EPROM with your
target application.
If you operate the MCB251 with a user application EPROM, you must set the
DIP switches 51/151, PAGE and SRC/D2 to OFF.
51/151: Default ON
The 51/151 switch selects whether a 251 or a 151/8051 compatible
microcontroller is installed in the IC1 socket. If a 151/8051 compatible device is
installed, 51/151 should be ON. If a 251 compatible device is installed, 51/151
should be OFF (unless the 251 is emulating an 8051 or 151 device).
A17: Default ON
The A17 switch selects whether the 251 CPU uses P1.7 as the A17 address line
or whether P1.7 is used as I/O port line. When A17 is ON, the A17 line is used
and you can address up to 256KB memory with the 251 device. When A17 is
OFF P1.7 can be used as I/O port line. Note that the CONFIG BYTES of the
251 CPU must be programmed correctly to use this feature.