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7751 Datasheet(PDF) 29 Page - Renesas Technology Corp

Part # 7751
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  540 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7751 Datasheet(HTML) 29 Page - Renesas Technology Corp

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CENTRAL PROCESSING UNIT (CPU)
7751 Group User’s Manual
2–10
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 12. CONNECTION WITH EXTERNAL DEVICES.”
2.2.1 Overview
Transfer operation between the CPU and memory•I/O devices is always performed via the BIU.
Figure 2.2.1 shows the bus and bus interface unit (BIU).
ΠThe 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.
Ž 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 Œ to Ž, the BIU inputs and outputs the control signals, and control the
bus.



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