參數(shù)資料
型號(hào): μPD784214
廠商: NEC Corp.
英文描述: 8/16 Bit Single Chip Microcontrollers(8/16 位單片微控制器)
中文描述: 8 / 16位單片機(jī)微控制器(8 / 16位單片微控制器)
文件頁數(shù): 51/88頁
文件大?。?/td> 427K
代理商: ΜPD784214
μ
PD784214,784215,784216
51
9.1 Memory Expansion
External program memory and data memory can be connected in two stages: 256 Kbytes and 1 Mbytes.
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 through 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
μPD784216 8/16 Bit Single Chip Microcontrollers(8/16 位單片微控制器)
μPD784215 8/16 Bit Single Chip Microcontrollers(8/16 位單片微控制器)
μPD784216Y 8/16 Bit Single Chip Microcontrollers(8/16位單片微控制器)
μPD784217Y 8 /16 Bit Single Chip Microcontrollers(8/16位單片微控制器)
μPD784218Y 8 /16 Bit Single Chip Microcontrollers(8/16位單片微控制器)
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