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MB90350E Datasheet(PDF) 25 Page - Fujitsu Component Limited.

No. de Pieza. MB90350E
Descripción  16-bit Proprietary Microcontrollers
Descarga  85 Pages
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Fabricante  FUJITSU [Fujitsu Component Limited.]
Página de inicio  http://edevice.fujitsu.com/fmd/en/index.html
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MB90350E Datasheet(HTML) 25 Page - Fujitsu Component Limited.

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MB90350E Series
25
6.
Treatment of 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 malfunction 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.
Connect VCC and VSS pins to the device from the current supply source at a possibly low impedance.
• As a measure against power supply noise, it is recommended to connect a capacitor of about 0.1
µF as a
bypass capacitor between VCC and VSS pins in the vicinity of VCC and VSS pins of the device.
7.
Pull-up/down resistors
The MB90350E 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
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.
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 power
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 simultaneously is acceptable).
10. Connection of unused pins of A/D converter if A/D converter is not used
Connect unused pins of A/D converter to AVCC
= VCC, AVSS = AVRH = VSS.
11. Notes on energization
To prevent the internal regulator circuit from malfunctioning, set the voltage rise time during energization at
50
µs or more (0.2 V to 2.7 V) .
Vcc
Vss
Vss
Vcc
Vss
Vcc
MB90350E
Series
Vcc
Vss
Vcc
Vss


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