參數(shù)資料
型號(hào): PSD611E1
英文描述: Field Programmable Microcontroller Peripherals with Embedded Micro--Cell(可編程邏輯,4K位SRAM,26個(gè)可編程I/O,通用PLD有63個(gè)輸入)
中文描述: 現(xiàn)場(chǎng)可編程微控制器外圍設(shè)備和嵌入式微-細(xì)胞(可編程邏輯,4K的位的SRAM,26我個(gè)可編程輸入/輸出,通用PLD的有63個(gè)輸入)
文件頁(yè)數(shù): 27/84頁(yè)
文件大?。?/td> 426K
代理商: PSD611E1
PSD6XX Family
11-27
Bus Interface
(cont.)
Data Byte Enable Reference
Microcontrollers have different data byte orientations. The following tables show how
the PSD6XXE1 interprets byte/word operation in different write bus configurations.
Even-byte refers to locations with address A0 equal to zero and odd byte as locations
with A0 equal to one.
BHE
A0
D7 – D0
X
0
Even Byte
X
1
Odd Byte
Table 13. 8-Bit Data Bus
BHE
A0
D15 – D8
D7 – D0
0
0
Odd Byte
Even Byte
0
1
Odd Byte
1
0
Even Byte
Table 14. 16-Bit Data Bus With BHE
WRH
WRL
D15 – D8
D7 – D0
0
0
Odd Byte
Even Byte
0
1
Odd Byte
1
0
Even Byte
Table 15. 16-Bit Data Bus With WRH and WRL
SIZ0
A0
D15 – D8
D7 – D0
0
0
Even Byte
Odd Byte
1
0
Even Byte
1
1
Odd Byte
Table 16. 16-Bit Data Bus With SIZ0, A0 (Motorola MCU)
LDS
UDS
D15 – D8
D7 – D0
0
0
Even Byte
Odd Byte
1
0
Even Byte
0
1
Odd Byte
Table 17. 16-Bit Data Bus With UDS, LDS (Motorola MCU)
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