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參數(shù)資料
| 型號： | M34554M8-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64 |
| 文件頁數(shù)： | 96/137頁 |
| 文件大?。?/td> | 1606K |
| 代理商： | M34554M8-XXXFP |
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61
4554 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Fig. 47 Switch to ceramic resonance/RC oscillation
Fig. 48 Handling of XIN and XOUT when operating ring oscillator
Fig. 49 Ceramic resonator external circuit
Fig. 50 External RC oscillation circuit
Execute the CMCK instruc-
tion in program.
Note: Externally connect a damping
resistor Rd depending on the
oscillation frequency.
(A feedback resistor is built-in.)
Use the resonator manu-
facturer’s recommended value
because constants such as ca-
pacitance depend on the
resonator.
(1) Main clock generating circuit (f(XIN))
The ceramic resonator or RC oscillation can be used for the main
clock of this MCU.
After system is released from reset, the MCU starts operation by
the clock output from the ring oscillator which is the internal oscilla-
tor.
When the ceramic resonator is used, execute the CMCK instruc-
tion. When the RC oscillation is used, execute the CRCK
instruction. The oscillation circuit by the CMCK or CRCK instruction
can be selected only at once. The oscillation circuit corresponding
to the first executed one of these two instructions is valid. Other os-
cillation circuit and the ring oscillator stop.
Execute the CMCK or the CRCK instruction in the initial setting rou-
tine of program (executing it in address 0 in page 0 is
recommended). Also, when the CMCK or the CRCK instruction is
not executed in program, this MCU operates by the ring oscillator.
(2) Ring oscillator operation
When the MCU operates by the ring oscillator as the main clock
(f(XIN)) without using the ceramic resonator or the RC oscillator,
connect XIN pin to VSS and leave XOUT pin open (Figure 48).
The clock frequency of the ring oscillator depends on the supply
voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
(3) Ceramic resonator
When the ceramic resonator is used as the main clock (f(XIN)), con-
nect the ceramic resonator and the external circuit to pins XIN and
XOUT at the shortest distance. Then, execute the CMCK instruction.
A feedback resistor is built in between pins XIN and XOUT (Figure
49).
(4) RC oscillation
When the RC oscillation is used as the main clock (f(XIN)), connect
the XIN pin to the external circuit of resistor R and the capacitor C
at the shortest distance and leave XOUT pin open. Then, execute
the CRCK instruction (Figure 50).
The frequency is affected by a capacitor, a resistor and a micro-
computer. So, set the constants within the range of the frequency
limits.
*
Reset
Ring oscillator
operation
CMCK instruction
CRCK instruction
Ceramic resonator valid
Ring oscillator stop
RC oscillation stop
RC oscillation valid
Ring oscillator stop
Ceramic resonator stop
M34554
XIN
XOUT
*
Do not use the CMCK instruction
and CRCK instruction in program.
M34554
XIN
XOUT
Rd
CIN
COUT
M34554
XIN
XOUT
R
C
*
Execute the CRCK
instruction in program.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34554MC-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556G8FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556G8HFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556M4H-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556M4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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