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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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7721 데이터시트(PDF) 32 Page - Renesas Technology Corp |
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7721 데이터시트(HTML) 32 Page - Renesas Technology Corp |
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32 / 577 page  CENTRAL PROCESSING UNIT (CPU) 7721 Group User’s Manual 2–9 2.2 Bus interface unit 2.2 Bus interface unit A bus interface unit (BIU) is built-in between the central processing unit (CPU) and memory•I/O devices. BIU’s function and operation are described below. When externally connecting devices, refer to “CHAPTER 3. CONNECTION WITH EXTERNAL DEVICES.” 2.2.1 Overview Transfer operation between the CPU and memory•I/O devices is always performed via the BIU. The BIU reads an instruction from the memory before the CPU executes it. When the CPU reads data from the memory•I/O device, the CPU first specifies the address from which data is read to the BIU. The BIU reads data from the specified address and passes it to the CPU. When the CPU writes data to the memory•I/O device, the CPU first specifies the address to which data is written to the BIU and write data. The BIU writes the data to the specified address. To perform the above operations to , the BIU inputs and outputs the control signals, and control the bus. Figure 2.2.1 shows the bus and bus interface unit (BIU). |
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