參數(shù)資料
型號(hào)： 784214AY
廠商： NEC Corp.
英文描述： MOS INTEGRATED CIRCUIT
中文描述： 馬鞍山集成電路
文件頁數(shù)： 59/100頁
文件大?。?/td> 564K
代理商： 784214AY
Data Sheet U14121EJ2V0DS00
59
μ
PD784214A, 784215A, 784216A, 784217A, 784218A, 784214AY, 784215AY, 784216AY, 784217AY, 784218AY
www.DataSheet4U.com
9.1 Memory Expansion
External program memory and data memory can be connected in two stages: 256 KB and 1 MB.
To connect the external memory, ports 4 through 6 and port 8 are used.
The external memory can be connected in the following two modes:
Multiplexed bus mode: The external memory is connected by using a time-division address/data bus. The
number of ports used when the external memory is connected can be reduced in this
mode.
Separate bus mode:
The external memory is connected by using an address bus and data bus independent
of each other. Because an external latch circuit is not necessary, this mode is useful for
reducing the number of components and mounting area on the printed wiring board.
9.2 Programmable Wait
Wait state(s) can be inserted to the memory space (00000H to FFFFFH) while the RD and WR signals are active.
In addition, there is an address wait function that extends the active period of the ASTB signal to gain the address
decode time.
相關(guān)PDF資料
PDF描述
784215A MOS INTEGRATED CIRCUIT
784215AY MOS INTEGRATED CIRCUIT
784216A MOS INTEGRATED CIRCUIT
784216AY MOS INTEGRATED CIRCUIT
784217A MOS INTEGRATED CIRCUIT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
784215A 制造商:NEC 制造商全稱:NEC 功能描述:MOS INTEGRATED CIRCUIT
784215AY 制造商:NEC 制造商全稱:NEC 功能描述:MOS INTEGRATED CIRCUIT
784216A 制造商:NEC 制造商全稱:NEC 功能描述:MOS INTEGRATED CIRCUIT
784216AY 制造商:NEC 制造商全稱:NEC 功能描述:MOS INTEGRATED CIRCUIT
784217A 制造商:NEC 制造商全稱:NEC 功能描述:MOS INTEGRATED CIRCUIT
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