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MC81F4316M Datasheet(PDF) 53 Page - Finechips |
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MC81F4316M Datasheet(HTML) 53 Page - Finechips |
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53 / 200 page  MC81F4x16 October 19, 2009 Ver.1.35 53 9. MEMORY ORGANIZATION This MCU has separated address spaces for the *program memory* and the *data Memory*. The program memory is a ROM which stores a program code. It is not possible to write a data at the program memory while the MCU is running. The Data Memory is a REM which is used by MCU at running time. 9.1 Registers There are few registers which are used for MCU operating. A ACCUMULATOR X X REGISTER Y Y REGISTER SP STACK POINTER PCL PROGRAM COUNTER PCH PSW PROGRAM STATUS WORD Accumulator( A Register ) : Accumulator is the 8-bit general purpose register, which is used for accumulating and some data operations such as transfer, temporary saving, and conditional judgment , etc. And it can be used as a part of 16-bit register with Y Register as shown below. A Y A Y Two 8-bit Registers can be used as a “YA” 16-bit Register X, Y Registers: In the addressing mode, these are used as a index register. It makes it possible to access at Xth or Yth memory from specific address. It is extremely effective for referencing a subroutine table and a memory table. These registers also have increment, decrement, comparison and data transfer functions, and they can be used as a simple accumulator. Figure 9-1 Configuration of Registers Figure 9-2 Configuration of YA 16-bit Registers |
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