M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 40

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Fig. 2.2.2 Register structure of bus interface unit (BIU)
Table 2.2.1 Functions of each register
CENTRAL PROCESSING UNIT (CPU)
2.2 Bus interface unit
Program address register
Instruction queue buffer
Data address register
Data buffer
2–12
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.
Name
b23
b23
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.
b15
DB
PA
DA
H
7702/7703 Group User’s Manual
b7
DB
Q
Q
Q
0
1
2
L
b0
b0
b0
b0
Program address register
Instruction queue buffer
Data address register
Data buffer
Functions