Keil MCB251, Руководство пользователя

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10 Chapter 2. Setup
CPU Selection
The MCB251 board can operate with various CPU types. The following table
gives you an overview of the various CPU operating modes. It lists values for
the configuration bytes of the 251 / 151 CPU used by the Monitor program. For
more information about the configuration registers, refer to the 251 or 151
Microcontroller User’s Manual.
NOTE
The settings in the following table are only relevant only for the Monitor
EPROM (Monitor DIP switch ON). When the Monitor DIP switch is OFF, you
may select the Memory Mapping and the CPU type with the MAP0 and MAP1
DIP switches.
CPU Type DIP Switch Setting CPU Config Bytes
and Operating Mode Page Src/D2 Map0 Map1 A17 Config0 Config1
251SB, 251G1 or 251A1
Page Mode, Source Mode
ON ON OFF OFF ON 0F1h 097h
251SB, 251G1 or 251A1
Page Mode, Binary Mode
ON OFF OFF OFF ON 0F0h 097h
251SB, 251G1 or 251A1
Non-page Mode, Source Mode
OFF ON OFF OFF ON 0F3h 097h
251SB, 251G1 or 251A1
Non-page Mode, Binary Mode
OFF OFF OFF OFF ON 0F2h 097h
Intel 151, Page Mode ON OFF ON ON OFF 0FCh 0E7h
Intel 151, Non-page Mode OFF OFF ON ON OFF 0FEh 0E7h
Standard 8051 Derivatives OFF OFF ON ON OFF N/A N/A
Dallas 320/520 OFF ON ON ON OFF N/A N/A
NOTE
The Temic 251A1 and 251G1 are currently available only as A-step devices. The
operating mode of this device is programmed inside the CPU and cannot be
changed in an external EPROM. If you use one of these devices you must set the
PAGE DIP switch OFF and the SRC/D2 DIP switch ON. This restriction does
not apply when the 251A1 and 251G1 are available in C-step technology.
The Intel 251SB CPU may be used to emulate the Intel 151 CPU. This lets you
test 151 applications without replacing the 251SB CPU.