| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for updating micro programs of a plurality of CPUs while satisfying a condition for rewriting operation that the size of a micro program has to be a half of a storage capacity of a control memory.SOLUTION: An electronic apparatus comprises: a main CPU 10; a sub CPU 20; and an analog switch 50. A host and the main CPU 10 are connected via a communication interface 30. The main CPU 10 and the sub CPU 20 are connected via a communication interface 40. The main CPU 10 writes an update micro program, which is received from the host via the communication interface 30, in an update memory area 21 via the communication interface 40. The sub CPU 20 causes conduction between a general interface 51 and an update interface 52 via the analog switch 50 by using a control interface 53, in order to write in a control memory 11 the update micro program which is stored in the update memory are 21. |
