參數(shù)資料
型號： M37702M2A-278FP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機
文件頁數(shù)： 11/59頁
文件大?。?/td> 811K
代理商： M37702M2A-278FP
11
MITSUBISHI MICROCOMPUTERS
M37702M2AXXXFP, M37702M2BXXXFP
M37702S1AFP, M37702S1BFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Instruction code read will be described first.
The CPU obtains instruction codes from the instruction queue
buffer and executes them. The CPU notifies the bus interface unit
that it is requesting an instruction code during an instruction code
request cycle. If the requested instruction code is not yet stored in
the instruction queue buffer, the bus interface unit halts the CPU
until it can store more instructions than requested in the instruction
queue buffer.
Even if there is no instruction code request from the CPU, the bus
interface unit reads instruction codes from memory and stores
them in the instruction queue buffer when the instruction queue
buffer is empty or when only one instruction code is stored and the
bus is idle on the next cycle.
This is referred to as instruction pre-fetching.
Normally, when reading an instruction code from memory, if the
accessed address is even the next odd address is read together
with the instruction code and stored in the instruction queue buffer.
However, in memory expansion mode or microprocessor mode, if
the bus width switching pin BYTE is “H”, external data bus width is
8 bits and the address to be read is in external memory area is
odd, only one byte is read and stored in the instruction queue
buffer. Therefore, waveform (1) or (3) in Figure 5 is used for in-
struction code read.
Data read and write are described below.
The CPU notifies the bus interface unit when performing data read
or write. At this time, the bus interface unit halts the CPU if the bus
interface unit is already using the bus or if there is a request with
higher priority. When data read or write is enabled, the bus inter-
face unit uses one of the waveforms from (1) to (6) in Figure 5 to
perform the operation.
During data read, the CPU waits until the entire data is stored in
the data buffer. The bus interface unit sends the address received
from the CPU to the address bus. Then it reads the memory when
the E signal is “L” and stores the result in the data buffer.
During data write, the CPU writes the data in the data buffer and
the bus interface unit writes it to memory. Therefore, the CPU can
proceed to the next step without waiting for write to complete. The
bus interface unit sends the address received from the CPU to the
address bus. Then when the E signal is “L”, the bus interface unit
sends the data in the data buffer to the data bus and writes it to
memory.
相關PDF資料
PDF描述
M37702M2A-XXXFP DIODE SCHOTTKY DUAL SERIES 50V 150mW 0.41V-vf 70mA-IFM 1mA-IF 0.1uA-IR SOT-523 3K/REEL
M37702M2B-XXXFP SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M37702M2BXXXFP SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M37702M2L-249HP SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M37702S1LGP SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
相關代理商/技術參數(shù)
參數(shù)描述
M37702M2AXXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M37702M2A-XXXFP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M37702M2BXXXFP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M37702M2B-XXXFP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M37702M2L 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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