參數(shù)資料
型號: ZPSD411A1
英文描述: Field Programmable Microcontroller Peripherals(可編程邏輯,零功耗,16K位SRAM,40個可編程I/O,通用PLD有37個輸入)
中文描述: 現(xiàn)場可編程微控制器外圍設備(可編程邏輯,零功耗,16K的位的SRAM,40余個可編程輸入/輸出,通用PLD的有37個輸入)
文件頁數(shù): 39/108頁
文件大小: 626K
代理商: ZPSD411A1
ZPSD4XX Famly
5-39
ZPSD4XX Interface To Non-Multiplexed Bus
Figure 22 shows a ZPSD4XX interfacing to a microcontroller with a non-multiplexed
address/data bus. The address bus is connected to the ADIO Port, and the data bus is
connected to Port C and/or Port D, depending on the bus width. There is no need for the
ADIO Port to latch the address internally, but the user is offered the option to do so in the
ZPSD4XX PSDsoft Software. The data Ports are in tri-state mode when the ZPSD4XX is
not accessed by the microcontroller.
Data Byte Enable
Microcontrollers have different data byte orientations with regard to the data bus. The
following tables show how the ZPSD4XX handles the byte enable under different bus
configurations. Even byte refers to locations with address A0 equal to “0”, and odd byte as
locations with A0 equal to “1”.
BHE
A0
D7 DD0
X
0
Even Byte
X
1
Odd Byte
Table 7. 8-Bit Data Bus
Table 8. 16-Bit Data Bus With BHE
BHE
A0
D15 DD8
D7 DD0
0
0
Odd byte
Even byte
0
1
Odd byte
1
0
Even byte
WRH
0
WRL
0
D15 DD8
Odd byte
D7 DD0
Even byte
0
1
Odd byte
1
0
Even byte
Table 9. 16-Bit Data Bus With WRHand WRL
SIZ0
A0
D15 DD8
D7 DD0
0
0
Even byte
Odd byte
1
0
Even byte
1
1
Odd byte
Table 10. 16-Bit Data Bus With SIZ0, A0
LDS
UDS
D15 DD8
D7 DD0
0
0
Even byte
Odd byte
1
0
Even byte
0
1
Odd byte
Table 11. 16-Bit Data Bus With UDS, LDS
Bus
Interface
(Cont.)
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