參數(shù)資料
型號: μPD705100
廠商: NEC Corp.
英文描述: 32 Bit Microprocessor(32 位微處理器)
中文描述: 32位微處理器(32位微處理器)
文件頁數(shù): 35/81頁
文件大?。?/td> 441K
代理商: ΜPD705100
35
CHAPTER 4 32-BIT BUS MODE
4.1.3 Operand Write
When an operand is being written, the relationship between the 32-bit data bus and internal registers is
as shown below.
In Figure 4-2, OPm indicates the byte position in the internal register. The relationship between OPm and
the internal register is as follows:
31
24 23
16 15
OP4
OP3
OP2
8 7
OP1
0
Internal register
Figure 4-2. Write Cycle (32-Bit Bus Mode)
(a) Byte (8 bits)
31
16 15
0
OP1
Operand address
Bit 1 Bit 0
0
0
0
1
1
0
1
1
External data bus
OP1
OP1
OP1
(b) Halfword (16 bits)
31
16 15
0
OP1
OP2
Internal registers
Operand address
Bit 1 Bit 0
0
0
1
0
OP1
OP2
(c) Word (32 bits)
31
16 15
OP4
OP3
OP2
OP1
0
External data bus
Operand address
Bit 1 Bit 0
0
0
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