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參數(shù)資料
| 型號(hào)： | M37545G8KP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO32 |
| 封裝： | 11 X 5.60 MM, 0.65 MM PITCH, PLASTIC, LSSOP-32 |
| 文件頁數(shù)： | 44/65頁 |
| 文件大?。?/td> | 782K |
| 代理商： | M37545G8KP |
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Rev.1.07
Mar 19, 2009
Page 47 of 60
REJ03B0140-0107
7545 Group
3. Oscillator concerns
So that the product obtains the stabilized operation clock on the
user system and its condition, contact the resonator manufacturer
and select the resonator and oscillation circuit constants.
Be careful especially when range of voltage and temperature is
wide.
Take care to prevent an oscillator that generates clocks for a
microcomputer 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
possible 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
controlling motors, LEDs, and thermal heads or others. When a
large current flows through those signal lines, strong noise
occurs because 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
CARR 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 program runaway.
Fig. 54 Wiring for a large current signal line/Writing of
signal lines where potential levels change
frequently
(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. 55 VSS pattern on the underside of an oscillator
XIN
XOUT
VSS
M
Mutual inductance
Large
current
GND
XIN
XOUT
VSS
CARR
Do not cross
N.G.
1. Keeping oscillator away from large current signal lines
2. Installing oscillator away from signal lines where potential
levels change frequently
Microcomputer
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37545G8-XXXGP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32 |
| M37546G2-XXXSP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37546G2HP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36 |
| M37546G4-XXXHP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36 |
| M37546G2-XXXGP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37545G8-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545GCGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545GCKP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545GC-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545GFGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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