MELPS740

MITSUBISHI MICROCOMPUTERS MELPS 740 SINGLE.CHIP I·BIT CMOS MICROCOMPUTER MELPS 740 CPU CORE BASIC FUNcnONS Each series of the MELPS 740 Family uses the standard MELPS 740 instruction set. The functions of the MELPS 740 CPU core are explained below. The multiply and divide in'structions are not available in every microcomputer, and the clock control instructions differ in each microcomputer. For details, refer to the table of machine instruction or the functional explanation of each microcomputer. CENTRAL PROCESSING UNIT (CPU) INTERNAL REGISTERS The central processing unit (CPU) has the six registers. Accumulator (A) The accumulator is an a-bit register. Data operations such as data transfer, etc., are executed mainly through the accumulator. Index register X (X), Index register Y (V) Both index register X and index register Yare a-bit registers. In the index addressing modes, the value of the OPERAND is added to the contents of register X or register Y and specifies the real address...