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參數(shù)資料
| 型號： | MB90F922NCSPMC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP120 |
| 封裝： | 16 X 16 MM, 1.70 MM HEIGHT, 0.50 M PITCH, PLASTIC, LQFP-120 |
| 文件頁數(shù)： | 10/72頁 |
| 文件大?。?/td> | 2151K |
| 代理商： | MB90F922NCSPMC |
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MB90920 Series
18
DS07-13750-3E
Notes on operating in PLL clock mode
On this microcontroller, if in case the crystal oscillator breaks off or an external reference clock input stops while
the PLL clock mode is selected, a self-oscillator circuit contained in the PLL may continue its operation at its
self-running frequency. However, Fujitsu will not guarantee results of operations if such failure occurs.
Crystal oscillator circuit
Noise around the X0/X1, or X0A/X1A pins may cause this device to operate abnormally. In the interest of stable
operation it is strongly recommended that printed circuit artwork places ground bypass capacitors as close as
possible to the X0/X1, X0A/X1A and crystal oscillator (or ceramic oscillator) and that oscillator lines do not cross
the lines of other circuits.
Please ask each crystal maker to evaluate the oscillational characteristics of the crystal and this device.
Power supply pins
Devices including multiple VCC or VSS pins are designed such that pins that need to be at the same potential
are interconnected internally to prevent malfunctions such as latch-up. To reduce unnecessary radiation, prevent
malfunctioning of the strobe signal due to the rise of ground level, and observe the standard for total output
current, be sure to connect the VCC and VSS pins to the power supply and ground externally.
Always connect all of the VCC pins to the same potential and all of the VSS pins to ground as shown in the
following diagram. The device will not operate correctly if multiple VCC or VSS pins are connected to different
voltages, even if those voltages are within the guaranteed operating ranges.
In addition, care must be given to connecting the VCC and VSS pins of this device to the current supply source
with as low impedance as possible. It is recommended that a 1.0
F bypass capacitor be connected between
the VCC and VSS pins as close to the pins as possible.
Sequence for connecting the A/D converter power supply and analog inputs
The A/D converter power supply (AVCC, AVRH) and analog inputs (AN0 to AN7) must be applied after the digital
power supply (VCC) is switched on. When turning the power off, the A/D converter power supply and analog
inputs must be disconnected before the digital power supply is switched off (VCC). Ensure that AVRH does not
exceed AVcc during either power-on or power-off. Even when pins which double as analog input pins are used
as input ports, be sure that the input voltage does not exceed AVCC (turning on/off the analog and digital power
supplies simultaneously is acceptable).
VCC
VCC
VSS
VSS
VSS
Power supply input pins (Vcc/Vss)
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