MCB251 Evaluation Board User’s Guide
11
Monitor Modes
The MCB251 board comes with a Monitor EPROM which contains several
different Monitor configurations. Most of the Monitor configurations are
required to run the different CPU types on the board. The following Monitor
settings are independent of the CPU type used in the MCB251 board.
DIP Switch
Monitor Mode
ext_Uart
ON: use EXT RS232 interface @ 57600 BPS. for Monitor communication.
OFF: use INT RS232 interface @ 19200 BPS. for Monitor communication.
LED
ON: display Monitor status on Port 1 LED’s (see below).
OFF: Monitor status is not displayed and Port 1 is not affected.
Monitor
ON: use Monitor program for debugging
OFF: User EPROM as IC13. Refer to “MAP1 and MAP0 DIP Switch” on
page 7 to for the User EPROM Memory Map.
NOTE
Some derivatives of the 8051 and 251 microcontroller family do not have a
compatible serial interface or baud rate generator for the internal serial
interface. For such devices it is impossible to use the INT RS232 interface.
Currently, the Temic 251A1 and standard 8051 CPU are not compatible. With
these devices you can only use the Monitor with the EXT RS232 interface—the
ext_Uart DIP switch must be ON.
Monitor Status Display
During the reset phase the Monitor program displays status information on the
Port 1 LEDs. This status information reflects the board configuration and signals
that the board is working correctly. The status byte is shifted to the left, which
flashes LED’s during the reset phase. The following table lists the first phase of
the LED pattern.
Monitor Version
P1.7
P1.6
P1.5
P1.4
P1.3
P1.2
P1.1
P1.0
Monitor 251 and 251 CPU
A17
OFF
OFF
OFF
OFF
OFF
OFF
ON
†
Monitor 51 for 151 or 8051 CPU
–
ON
ON
ON
ON
ON
ON
ON
†
Monitor 51 for Dallas 320/520
–
ON
OFF
ON
OFF
ON
OFF
ON
†
† The P1.0 status LED is ON when the INT RS232 interface is used for the Monitor/PC interface
and OFF when the EXT RS232 interface is used for the Monitor/PC interface.
Summary of Contents for MCB251
Page 6: ...vi Contents...
Page 18: ...12 Chapter 2 Setup...
Page 24: ...18 Chapter 3 Hardware Schematics...
Page 25: ...MCB251 Evaluation Board User s Guide 19...
Page 26: ...20 Chapter 3 Hardware...
Page 27: ...MCB251 Evaluation Board User s Guide 21...
