參數(shù)資料
型號: UPD784054GCA1
廠商: NEC Corp.
英文描述: 16-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16位單片機
文件頁數(shù): 46/86頁
文件大?。?/td> 579K
代理商: UPD784054GCA1
μ
PD784054(A)
46
9.2 Memory Space
The 1M-byte memory space is divided into the following eight spaces of logical addresses. Each space can
be controlled by using the programmable wait function and bus sizing function.
Figure 9-2. Memory Space
512K bytes
256K bytes
128K bytes
64K bytes
16K bytes
16K bytes
16K bytes
16K bytes
H
F
F
F
F
F
H
H
0
F
0
F
0
F
0
F
8
7
H
H
0
F
0
F
0
F
0
F
4
3
H
H
0
F
0
F
0
F
0
F
2
1
H
H
0
F
0
F
0
F
0
F
1
0
H
H
0
F
0
F
0
F
C
B
0
0
H
H
0
F
0
F
0
F
8
7
0
0
H
H
0
F
0
F
0
F
4
3
0
0
H
0
0
0
0
0
9.3 Programmable Wait
A wait state can be inserted to each of the eight memory spaces while the RD, LWR, and HWR signals are
active. Even if memories with different access times are connected, therefore, the overall efficiency of the system
is not degraded.
In addition, an address wait function that extends the active period of the ASTB signal is also available to
extend the address decode time (this function can be set to all the spaces).
9.4 Bus Sizing Function
The
μ
PD784054(A) can change the external data bus width between 8 and 16 bits when an external device
is connected. Even if the memory space is divided by eight, the bus width of each memory space can be specified
independently.
相關PDF資料
PDF描述
UPD784224YGC 16/8-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784225YGC 16/8-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784225YGK 16/8-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784225GC 16/8-BIT SINGLE-CHIP MICROCONTROLLERS
UPD784225GK 16/8-BIT SINGLE-CHIP MICROCONTROLLERS
相關代理商/技術參數(shù)
參數(shù)描述
UPD784218AGC-382-8EU-NRE-A 制造商:Renesas Electronics Corporation 功能描述:
UPD784218AGC-382-8EU-SES-A 制造商:Renesas Electronics Corporation 功能描述:
UPD784935AGF-113-3BA 制造商:NEC Electronics Corporation 功能描述:
UPD784938AGF-188-3BA 制造商:NEC Electronics Corporation 功能描述:
UPD789104AMC(A)-968-5A4-E2 制造商:Renesas Electronics Corporation 功能描述: