Measurement OP (MOP)/OP=87

Format

OP AF BF A Syllable B Syllable

OP = 87

AF A length of six (6) must be specified directly or as an indirect field length or a literal.

BF A length of six (6) must be specified directly or as an indirect field length.

A is the address of the Setting field. The address may be indexed, indirect or extended. The final address controller must be equal to UN or an Invalid Instruction (IEX = 03) fault will occur.

B is the address of the Mask field. The address may be indexed, indirect or extended. The final address controller must be equal to UN or an Invalid Instruction (IEX = 03) fault will occur.

Function

The Measurement instruction is used to load the User portion of the Measurement Register. The Measurement register is an eight digit register with outputs that are made available as external outputs of the processor so that they may be monitored by various hardware monitoring devices.

The six digit Mask field will be read from a memory location (B) and used to detemrine which bits in the Measurement register are capable of being changes by the Setting field which is also located in memory (A).

Each bit in the Mask field that is equal to a “one” will permit the corresponding bit in the Measurement register User field to assume the satte of the corresponding bit in the Setting field (A).

Each bit in the Mask field that is euqla to a “zero” will prevent changes to the corresponding bit in the Measurement register User field.

The MOPOK signal, available externally, will be held to “zero” at any time that the Measurement register is being changed and held to a “one” at all other times.

The Measurement register is changed by the Virtual Branch Reinstate, Branch Communicate, HyperCall and Return instructions. It is also changed by the Interrupt and Hardware Call procedures.

Comparison and Overflow Flags

Not modified by this instruction.

Overlap

Field overlap is not applicable to this instruction.

Examples

instructions/mop.txt · Last modified: 2017/06/27 11:33 by scott
 
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