| 摘要 |
<p>PURPOSE: To simplify an internal self-testing function by calling a microcode itself by one byte, and inspecting the microcode for display stored outside a check code stored in an ROM or the microcode. CONSTITUTION: A microcomputer chip 10 is composed of a combination ROM 11, RAM 12, entry point 21, group decode circuit 27, memory control circuit 28, interruption control circuit 29, and clock generator 33. The inspection code display of all the bits of all the plural microcode words is stored in the ROM 11. Then, access to a plurality of microcode words in fewer sets than plural control bits is performed, the cumulative sequence arithmetic operation of all the control bits of all the plural microwords is operated, and when the cumulative arithmetic results are equivalent to the inspection code display, a first output is generated, and otherwise a second output is generated. Thus, the simple internal self-testing function can be obtained.</p> |
