If specified coprocessor condition is true, exception vector nunber 7 is generated. Value of saved PC is next instruction one (return address). If given condition is false, PC takes the value of next instruction. Immediate data placed at instruction end is an information which can be used by the exception sub-routine.
----------------------------------------------------------------- |15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |---|---|---|---|-----------|---|---|---|---|---|---|-----------| | 1 | 1 | 1 | 1 | CP-ID =! 0| 0 | 0 | 1 | 1 | 1 | 1 | OP-MODE | |---|---|---|---|-----------|---|---|---|-----------------------| | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |COPROSSESSOR CONDITION | |---------------------------------------------------------------| | OPTIONAL COPROCESSOR EXTENSION WORD | |---------------------------------------------------------------| | 16 BITS DATA or | |---------------------------------------------------------------| | 32 BITS DATA (LOW WEIGHT PART) | ----------------------------------------------------------------- OP-MODE 010->instruction contains a 16 bits operand. 011->instruction contains a 32 bits operand. 100->instruction has no operands. CP-ID field identify coprocessor (1 to 7). If CP-ID=0, "line emulation F" exception is generated. "COPROSSESSOR CONDITION" field, specifies condition to test. This condition is addressed to coprocessor which, after examining this one, address directives to processor in order to execute the instruction.