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7721 bảng dữ liệu(PDF) 34 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  16-BIT SINGLE-CHIP MICROCOMPUTER
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CENTRAL PROCESSING UNIT (CPU)
7721 Group User’s Manual
2–11
2.2 Bus interface unit
2.2.2 Functions of bus interface unit (BIU)
The bus interface unit (BIU) consists of four registers shown in Figure 2.2.2. Table 2.2.1 lists the functions
of each register.
Program address register
Instruction queue buffer
Data address register
Data buffer
PA
DA
Q0
Q1
Q2
DBH
DBL
b23
b0
b0
b0
b0
b23
b15
b7
Table 2.2.1 Functions of each register
Functions
Indicates the storage address for the instruction which is next taken into the
instruction queue buffer.
Temporarily stores the instruction which has been taken in.
Indicates the address for the data which is next read from or written to.
Temporarily stores the data which is read from the memory•I/O device by the
BIU or which is written to the memory•I/O device by the CPU.
Name
Program address register
Instruction queue buffer
Data address register
Data buffer
Fig. 2.2.2 Register structure of bus interface unit (BIU)



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