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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 works correctly. The status byte shifts to the left, which flashes the LEDs 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 for
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 320/420/520
OFF ON OFF ON OFF ON OFF ON
Monitor 51 for
8xC51Rx+/Rx2
OFF OFF OFF OFF OFF OFF ON 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.
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