| 摘要 |
PURPOSE:To reference the content of a user side memory by supplying data read from the use memory to a 2nd microprocessor when an address signal corresponding to a prescribed address set in a memory reference control means is supplied from a 1st microprocessor during the execution of a user program. CONSTITUTION:When an address signal outputted from a slave microcomputer SMCU is coincident with an address corresponding to a control data CD having a level '1b set in a control memory CM in advance during the execution of the use program, the data read from a user memory UM or a substitution memory SM to a slave data bus SDB is latched by a latch circuit LAT. Thus, a master microcomputer MMCU bring a read control signal RC to a read level in a desired timing. Thus, the data of a prescribed address to be referenced in the substitution memory SM or the user memory UM is referenced without stopping the execution of the user program. |
