| 摘要 |
PURPOSE:To obtain a device which outputs high-reliability processing programs from ROMs by storing fixed patterns for a test of a collating circuit respectively in a couple of ROMs, and testing the collating circuit by the fixed patterns. CONSTITUTION:In a couple of ROMs, fixed patterns for a test of a collating circuit are stored and the collating circuit is tested by the fixed pattern. For example, address code for a collating-circuit testing is inputted to a terminal 1 and an address decoding circuit 2 decodes the input into a testing address, which is inputted to ROMs 9 and 10. By a testing address inputted next, fixed patterns 11 and 12 are read out of the ROMs 9 and 10 and compared with each other by a collating circuit 5. If the collation result shows coincidence, the collating circuit 5 outputs a coincidence signal to open a gate circuit 6, and a CPU8 is driven through a data driving circuit 7; when not, the collating circuit 5 sends out a dissidence signal to close the gate circuit 6, and the processing of the CPU8 is stopped. |
