參數(shù)資料
型號(hào)： M34501M4
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機(jī)的CMOS
文件頁(yè)數(shù)： 45/113頁(yè)
文件大?。?/td> 1252K
代理商： M34501M4
45
4501 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
CLOCK CONTROL
The clock control circuit consists of the following circuits.
Ring oscillator (internal oscillator)
Ceramic oscillator
RC oscillation circuit
Multi-plexer (clock selection circuit)
Frequency divider
Internal clock generating circuit
Fig. 41 Clock control circuit structure
The system clock and the instruction clock are generated as the
source clock for operation by these circuits.
Figure 41 shows the structure of the clock control circuit.
The 4501 Group operates by the ring oscillator clock (f(RING))
which is the internal oscillator after system is released from reset.
Also, the ceramic resonator or the RC oscillation can be used for
the source oscillation (f(X
IN
)) of the 4501 Group. The CMCK in-
struction or CRCK instruction is executed to select the ceramic
resonator or RC oscillator, respectively.
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CMCK
instruction
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RESET pin
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Key-on wakeup signal
Instruction clock
Counter
Wait time (Note 2)
control circuit
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divided by 8
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Internal clock
generation circuit
(divided by 3)
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Ceramic resonator
circuit
POF or
EPOF instruction + POF2
instruction
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