Integrated circuit on chip instrument controller

An integrated circuit comprising:

• a plurality of on-chip-instrument-modules;
• a test-controller-module configured to communicate data with the plurality of on-chip-instrument-modules;
• a functional-module configured to communicate data with the plurality of on-chip-instrument-modules;
• and
• an on-chip-instrument-controller configured to:
• for each of the plurality of on-chip-instrument-modules, store an access-indicator;
• and
• based on a value of the access-indicator for each on-chip-instrument-module, enable the on-chip-instrument-module to communicate with either:
• the test-controller-module;
• or
• the functional-module;
• further comprising a test-interface-port configured to communicate data with the test-controller-module to set individual values of the access-indicator for each on-chip-instrument-module, wherein the on-chip-instrument-controller is configured to set a particular access-indicator value to enable communications between the test-controller-module and a particular on-chip-instrument-module in response to test-instructions received at the test-interface-port.