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參數(shù)資料
| 型號： | M3826AMFA-XXXGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 58/95頁 |
| 文件大?。?/td> | 1006K |
| 代理商： | M3826AMFA-XXXGP |
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Rev.2.00
May. 24, 2006
page 59 of 90
REJ03B0028-0200
3826 Group (A version)
(3) Oscillator concerns
In order to obtain the stabilized operation clock on the user system
and its condition, contact the oscillator manufacturer and select
the oscillator and oscillation circuit constants. Be careful espe-
cially when range of voltage or/and temperature is wide.
Also, take care to prevent an oscillator that generates clocks for a
microcomputer operation from being affected by other signals.
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 toler-
ance 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 oc-
curs because of mutual inductance.
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 program runaway.
Keeping oscillator away from large current signal lines
Installing oscillator away from signal lines where potential
levels change frequently
Fig. 66 Wiring for a large current signal line/Wiring of signal
lines where potential levels change frequently
(4) Analog input
The analog input pin is connected to the capacitor of a compara-
tor. Accordingly, sufficient accuracy may not be obtained by the
charge/discharge current at the time of A/D conversion when the
analog signal source of high-impedance is connected to an analog
input pin. In order to obtain the A/D conversion result stabilized
more, please lower the impedance of an analog signal source, or
add the smoothing capacitor to an analog input pin.
(5) Difference of memory type and size
When Mask ROM and PROM version and memory size differ in
one group, actual values such as an electrical characteristics, A/D
conversion accuracy, and the amount of proof of noise incorrect
operation may differ from the ideal values.
When these products are used switching, perform system evalua-
tion for each product of every after confirming product
specification.
XIN
XOUT
VSS
Microcomputer
Mutual inductance
Large
current
GND
M
XIN
XOUT
VSS
CNTR
Do not cross
N.G.
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