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)
文件頁數(shù): 49/81頁
文件大小: 441K
代理商: ΜPD705100
49
CHAPTER 5 16-BIT BUS MODE
5.2.3 Operand Write
While an operand is being written, the relationship between the 16-bit data bus and internal registers is
as explained below.
In Figure 5-6, n;OPm indicates that the m-th byte of data from the internal register has been output to the
data bus at the n-th external access. The relationship between OPm and the internal register is as follows:
31
24 23
16 15
OP4
OP3
OP2
8 7
OP1
0
External data bus
Figure 5-6. Write Cycle (16-Bit Bus Mode)
(a) Byte (8 bits)
15
0
1;OP1
1;OP1
Operand address
Bit 1 Bit 0
0
0
0
1
1
0
1
1
External data bus
1;OP1
1;OP1
(b) Halfword (16 bits)
15
0
1;OP1
1;OP1
Operand address
Bit 1 Bit 0
0
0
1
0
External data bus
1;OP2
1;OP2
(c) Word (32 bits)
15
0
1;OP1
2;OP3
Operand address
Bit 1 Bit 0
0
0
External data bus
1;OP2
2;OP4
Tw1 state
Tw2 state
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