DATA PROCESSING DEVICE, MICROCONTROLLER, AND SELF-DIAGNOSIS METHOD OF DATA PROCESSING DEVICE

摘要

A data processing device according to the present invention includes a memory, an arithmetic circuit that accesses the memory by outputting an access control signal CTRL that controls access to the memory, a first data storage unit that stores first data used when a self-diagnosis is performed, a read-modify-write circuit that generates second data by replacing a part of the first data stored in the first data storage unit with modify data outputted from the arithmetic circuit, and a determination unit that diagnoses a failure of the read-modify-write circuit by comparing the second data with an expected value.

主权项

1. A test method for a data processing device including a read-modify-write function, the test method comprising the steps of:
(a) performing the read-modify-write function for first data by the data processing device to generate second data; and (b) comparing the second data with expected data by the data processing unit, wherein the data processing device invalidates other data processing during a period between the steps (a) and (b).