4.5 U S E R S APPLICATION SPECIFIC CODE
4.5.1 L o a d i n g Application Code
This section describes the methods of loading code into the Message-Based Interface.
4.5.2 S -Record Download
The Message-Based Interface allows the user to download a named block of executable
code as a sequence of Motorola S-records. A t the time the user links the application
code, the target load address should be set either in the uncommitted RAM area, or in the
Message-Based Interface user global area. A s the Message-Based Interface receives each
S-Record, it unpacks and loads the encoded data into the specified addresses. I t is the
user's responsibility to manage the contents of the uncommitted RAM area and the user
global area. T h e Message-Based Interface will dutifully overwrite any existing section
of the user global area while unpacking S-records. The number of individual blocks that
may be downloaded is only constrained by the physical size of the uncommitted RAM
area and the user global area.
A C-style identifier is associated with each block of downloaded code. T h e Message-
Based Interface stores this identifier into its global symbol table for later reference.
The precise syntactical mechanics of this operation are spelled out in the section on
Message-Based Interface command syntax. The following example w i l l illustrate the
process:
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