 MCBx51 User's Guide | |
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MCBx51 User's Guide
Introduction Setup
Board Setup Board Components Connecting the MCBx51 Configuring the MCBx51 DIP Switches Configuration Jumpers Monitor Modes Monitor Status Display Microcontroller Selection Theory of Operation 251 Devices 8051 DevicesMonitor 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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