MB90352 Ver la hoja de datos (PDF) - Fujitsu

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componentes Descripción

Fabricante

MB90352

16-bit Proprietary Microcontroller

Fujitsu 

MB90350 Series

5. Notes on during operation of PLL clock mode

If the PLL clock mode is selected, the microcontroller attempt to be working with the self-oscillating circuit even

when there is no external oscillator or external clock input is stopped. Performance of this operation, however,

cannot be guaranteed.

6. Power supply pins (VCC/VSS)

• If there are multiple VCC and VSS pins, from the point of view of device design, pins to be of the same potential

are connected inside of the device to prevent such malfunctioning 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.

• Connect VCC and VSS to the device from the current supply source at a low impedance.

• As a measure against power supply noise, connect a capacitor of about 0.1 µF as a bypass capacitor between

VCC and VSS in the vicinity of VCC and VSS pins of the device

Vcc

Vss

Vcc

Vss

MB90350

Vcc Series

Vss

Vcc

Vss

Vss

Vcc

7. Pull-up/down resistors

The MB90350 Series does not support internal pull-up/down resistors (Port 0 to Port 3: built-in pull-up resistors).

Use external components where needed.

8. Crystal Oscillator Circuit

Noises around X0 or X1 pins may be possible causes of abnormal operations. Make sure to provide bypass

capacitors via shortest distance from X0, X1 pins, crystal oscillator (or ceramic resonator) and ground lines, and

make sure, to the utmost effort, that lines of oscillation circuit do not cross the lines of other circuits.

It is highly recommended to provide a printed circuit board art work surrounding X0 and X1 pins with a ground

area for stabilizing the operation.

9. Turning-on Sequence of Power Supply to A/D Converter and Analog Inputs

Make sure to turn on the A/D converter power supply (AVCC, AVRH) and analog inputs (AN0 to AN14) after

turning-on the digital power supply (VCC) .

Turn-off the digital power after turning off the A/D converter supply and analog inputs. In this case, make sure

that the voltage does not exceed AVRH or AVCC (turning on/off the analog and digital power supplies simulta-

neously is acceptable).

10. Connection of Unused Pins of A/D Converter if A/D Converter is used

Connect unused pins of A/D converter to AVCC = VCC, AVSS = AVRH = VSS.

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