TSK3000A - Special Purpose Instructions

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Modified by Admin on Sep 13, 2017

There are three special instructions used for breakpoints and exceptions.

Table 1. Special Purpose Instructions.
     Mnemonic     
              Instruction              
Description

BREAK code

Breakpoint

If the OCDS is active then the processor will stop at this point and flush any instructions that have entered the pipeline after the break instruction

RFE

Restore From Exception

Copies the control register bits for previous interrupt mask mode and previous user mode (IEp and UMp) to the current mode bits (IEc and UMc) and copies the old mode bits (IEo and UMo) to the previous mode bits (IEp and UMp). The old mode bits remain unchanged

SYSCALL code

System Call

Raises a System Call exception and passes control to an exception handler. The code field can be used to pass information to an exception handler, but the only way to have the code field retrieved by the exception handler is to use the exception return register to load the contents of the memory word containing this instruction

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