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參數(shù)資料
| 型號(hào)： | M34556M4H-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁數(shù)： | 105/145頁 |
| 文件大小： | 1066K |
| 代理商： | M34556M4H-XXXFP |
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Rev.3.02
Dec 22, 2006
page 62 of 142
REJ03B0025-0302
4556 Group
3. Oscillator concerns
Take care to prevent an oscillator that generates clocks for a micro-
computer operation from being affected by other signals.
(1) Keeping oscillator away from large current signal lines
Install a microcomputer (and especially an oscillator) as far as pos-
sible from signal lines where a current larger than the tolerance of
current value flows.
<Reason>
In the system using a microcomputer, there are signal lines for con-
trolling motors, LEDs, and thermal heads or others. When a large
current flows through those signal lines, strong noise occurs be-
cause of mutual inductance.
(2) Installing oscillator away from signal lines where potential levels
change frequently
Install an oscillator and a connecting pattern of an oscillator away
from signal lines where potential levels change frequently. Also, do
not cross such signal lines over the clock lines or the signal lines
which are sensitive to noise.
<Reason>
Signal lines where potential levels change frequently (such as the
CNTR pin signal line) may affect other lines at signal rising edge or
falling edge. If such lines cross over a clock line, clock waveforms
may be deformed, which causes a microcomputer failure or a pro-
gram runaway.
Fig. 58 Wiring for a large current signal line
XIN
XOUT
VSS
M
Microcomputer
Mutual inductance
Large
current
GND
(3) Oscillator protection using Vss pattern
As for a two-sided printed circuit board, print a Vss pattern on the
underside (soldering side) of the position (on the component side)
where an oscillator is mounted.
Connect the Vss pattern to the microcomputer Vss pin with the
shortest possible wiring. Besides, separate this Vss pattern from
other Vss patterns.
Fig. 60 Vss pattern on the underside of an oscillator
XIN
XOUT
VSS
An example of VSS patterns on the
underside of a printed circuit board
Oscillator wiring
pattern example
Separate the VSS line for oscillation from other VSS lines
XIN
XOUT
VSS
CNTR
Do not cross
N.G.
Fig. 59 Wiring to a signal line where potential levels change
frequently
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| M34559G6FP | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP52 |
| M34571GD-XXXFP | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO24 |
| M34571G6-XXXFP | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO24 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34556M4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556M8H-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556M8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556MXH-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556MX-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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