Specifications

3-19
ERROR CODES
Under certain conditions the LMD will display various
error codes. In many cases these are codes which
have been incorporated for use by the developer and
are not of value to the end user. What follows is a
brief discussion on the various error codes and
conditions.
Comm Status Screen…’Stat’ Field
The meaning of this field varies, depending on the
Port’s Mode. In most cases it displays the content of
the byte in the port’s buffer structure, which, because
of its dynamic nature, is of little value to the end user.
When port mode is MATS, MIST, or MDM100, and the
port error count (‘Errs’ field) is non-zero, the field is
overwritten and error information is displayed. In
these cases, the ‘Stat’ field will display one of the
following error codes:
1f – Invalid Message Structure Received
2f – Unrecognized Command Received
3f – CRC Error in Received Message
4f – No Reply from LNME During Monitor Upload
When ‘CLEAR’ is pressed, this screen is cleared.
Since this also clears the ‘Errs’ count field, it will also
cause the ‘Stat’ field to revert to its default mode
(takes it out of error code mode) until the error count
again becomes non-zero.
CPU Failure Screen
This screen appears when the processor suffers a
catastrophic failure. Because of the nature of the
failure only limited information is available, however
the CPU does provide its best estimate of the possible
error. None of these faults can occur under normal
operation, so the most that can usually be inferred is
that the problem is with one of the basic operating
components; the CPU itself, the memory (RAM or
PROM), or the Vcc supply. The possible error codes
are as follows:
604 – Non-Maskable Interrupt Occurred
648 – Stack Overflow
64c – Memory Access Violation
654 – Privileged Instruction Violation