| 摘要 |
PURPOSE:To indicate immediately a jump destination address satisfying conditions by providing a jump destination table and changing and designating the lower bit of the jump destination address having plural branch destinations. CONSTITUTION:If external interrupt conditions are required on the way of execution of a normal program processing and these conditions are an external interrupt signal (a), a table selecting circuit 5 selects a jump destination table 6 corresponding to the signal (a). The table y sets the signal (a) to ''0'' and sends it to a selecting circuit 7. The circuit 7 converts a jump destination address AAAA consisting of 4 bits to an address AAA0 and designates this address AAA0. When this address is indicated by a program counter circuit PC3, an instruction memory circuit IM1 discriminates the jump destination address, namely, a data transmission processing instruction to execute a processing program. Thus, the jump destination address satisfying conditions is indicated immediately. |
