Motorola MVME2600 Series User Manual download pdf (Page 62)

100

101

Preserving the Operating Environment

2-10

Whenever the host hardware is reset, the target IP is initialized to

$00004000 (i.e., just above the memory space of the exception vector

table), and the target pseudo stack pointer is initialized to the

starting location of the debugger's read/write memory space. The

target IP will be set to the appropriate address if a program load

operation (e.g., the PBOOT command) is initiated.

Note that user programs should handle the stack area properly in

that it should not write starting at the initialized location. Some

compilers and assemblers may write to the stack prior to

decrementing the stack.

This read/write memory space that is allocated for the debugger,

and by the debugger, may increase in future releases. To properly

compensate for the increased read/write memory requirements,

user programs may utilized the target register R1 as indicator for

the top (plus 1) of usable memory.

Exception Vectors

The following exception vectors are reserved for use by the

debugger:

These vectors may be taken over under a userÕs application.

However, prior to returning control to the debugger these vectors

must be restored for proper operation of the affected features.

MPU Registers

Certain MPU registers must be preserved for their specific uses.

00100 - System Reset Used for the abort switch soft reset feature

00700 - Program Used for instruction breakpoints

00C00 - System Call Used for the System Call Handler

02000 - Run Mode Used for instruction tracing

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Motorola MVME2600 Series User Manual Page 62

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