參數(shù)資料
型號(hào): 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(yè)數(shù): 48/81頁(yè)
文件大?。?/td> 441K
代理商: ΜPD705100
48
V830
TM
USER'S MANUAL
5.2.2 Operand Read
While an operand is being read, the relationship between the 16-bit data bus and internal registers is as
explained below.
In Figure 5-5, n;Bm indicates that the m-th byte of the external data bus has been read at the n-th external
access. The relationship between Bm and the external data bus is as follows:
16
8 7
B2
B1
0
External data bus
Figure 5-5. Read Cycle (16-Bit Bus Mode)
(a) Byte (8 bits)
31
16 15
0
1;B1
1;B2
1;B1
1;B2
Operand address
Bit 1 Bit 0
0
0
0
1
1
0
1
1
Internal registers
(b) Halfword (16 bits)
31
16 15
0
1;B1
1;B1
1;B2
1;B2
Internal registers
Operand address
Bit 1 Bit 0
0
1
0
0
(c) Word (32 bits)
31
16 15
0
1;B1
1;B2
Internal registers
Operand address
Bit 1 Bit 0
0
0
2;B3
2;B4
Tw1 state
Tw2 state
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