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Debugger General Information

Reset

Pressing and releasing the MVME177 front panel RESET switch initiates a system reset. COLD and WARM reset modes are available. By default, 177Bug is in COLD mode. During COLD reset, a total system initialization occurs, as if the MVME177 had just been powered up. In other words, during a COLD reset:

All static variables (including disk device and controller parameters) restore to their default states

The breakpoint table and offset registers are cleared

The target registers are invalidated

Input and output character queues are cleared

Onboard devices (timer, serial ports, etc.) are reset

The first two serial ports are reconfigured to their default state During WARM reset, the 177Bug preserves the following:

Variables

Tables

Target state registers

Breakpoints

Reset must be used if the processor ever halts, or if the 177Bug environment is ever lost (vector table is destroyed, stack corrupted, etc.).

Abort

You can initiate an abort by pressing and releasing the ABORT switch on the MVME177 front panel. If an abort is initiated while executing a user program (running target code), a ÒsnapshotÓ of the processor state is captured and stored in the target registers. For this reason, abort is most appropriate when terminating a user

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Motorola MVME177 manual Reset, Abort