Microcomputer having built-in nonvolatile memory and check...

Details Microcomputer having built-in nonvolatile memory and check... Microcomputer having built-in nonvolatile memory and check...

2005-12-27

2005-12-27

Iqbal, Nadeem (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S030000, C714S031000, C714S042000, C713S002000

Reexamination Certificate

active

06981179

ABSTRACT:
When a built-in nonvolatile memory in a microcomputer is tested, a control program prestored in a boot ROM is run upon entering a test command from an external communication device; a test program is transferred from the external communication device to a built-in RAM through a communication circuit; a control of a CPU is switched to the built-in RAM after the test program has been transferred and a test is conducted on the nonvolatile memory; and a test result and a fail log are transferred to the external communication device through the communication circuit. Consequently, the built-in nonvolatile memory in the microcomputer can be checked without leaving the test program on the chip.

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