参数资料
型号: 784215A
厂商: NEC Corp.
英文描述: MOS INTEGRATED CIRCUIT
中文描述: 马鞍山集成电路
文件页数: 59/100页
文件大小: 564K
代理商: 784215A
Data Sheet U14121EJ2V0DS00
59
μ
PD784214A, 784215A, 784216A, 784217A, 784218A, 784214AY, 784215AY, 784216AY, 784217AY, 784218AY
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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.
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784215AY MOS INTEGRATED CIRCUIT
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784216AY MOS INTEGRATED CIRCUIT
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784217AY MOS INTEGRATED CIRCUIT
相关代理商/技术参数
参数描述
784215AY 制造商:NEC 制造商全称:NEC 功能描述:MOS INTEGRATED CIRCUIT
784216A 制造商:NEC 制造商全称:NEC 功能描述:MOS INTEGRATED CIRCUIT
784216AY 制造商:NEC 制造商全称:NEC 功能描述:MOS INTEGRATED CIRCUIT
784217A 制造商:NEC 制造商全称:NEC 功能描述:MOS INTEGRATED CIRCUIT
784217AY 制造商:NEC 制造商全称:NEC 功能描述:MOS INTEGRATED CIRCUIT