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): 34/81頁
文件大?。?/td> 441K
代理商: ΜPD705100
34
V830
TM
USER'S MANUAL
4.1.2 Operand Read
When an operand is being read, the relationship between the 32-bit data bus and internal registers is as
shown below.
In Figure 4-1, Bm indicates that the m-th byte of the external data bus has been read. The relationship
between Bm and the external data bus is as follows:
31
24 23
16 15
B4
B3
B2
8 7
B1
0
External data bus
Figure 4-1. Read Cycle (32-Bit Bus Mode)
(a) Byte (8 bits)
31
16 15
0
B1
B2
B3
B4
Operand address
Bit 1 Bit 0
0
0
0
1
1
0
1
1
Internal registers
(b) Halfword (16 bits)
31
16 15
0
B1
B3
B2
B4
Internal registers
Operand address
Bit 1 Bit 0
0
1
0
0
(c) Word (32 bits)
31
16 15
B4
B3
B2
B1
0
Internal registers
Operand address
Bit 1 Bit 0
0
0
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