Central processing unit and microcomputer having testing of circ

Electrical computers and digital processing systems: processing – Processing architecture – Microprocessor or multichip or multimodule processor having...

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714 30, 712 38, G06F 1500

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active

060584688

ABSTRACT:
A microcomputer has a first external terminal for receiving an external control signal that indicates a test mode of peripheral circuits, and a second external terminal connected to a data bus. A CPU of the microcomputer provides a bus control signal in response to the external control signal passed through the first external terminal, to write data passed through the second external terminal into the peripheral circuits. Upon receiving the external control signal, a bus controller of the CPU stops a bus cycle requested by an execution controller of the CPU and starts a bus cycle requested by the external control signal, to test the peripheral circuits.

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