mb90f345caspfv Fujitsu Microelectronics, Inc., mb90f345caspfv Datasheet - Page 24

• Manufacturer Part Number: mb90f345caspfv
• Description: 16-bit Proprietary Microcontroller Cmos 2 F2mc-16lx Mb90340 Series
• Manufacturer: Fujitsu Microelectronics, Inc.

24
MB90340 Series
5. Notes on during operation of PLL clock mode
6. Power supply pins (V
7. Pull-up/down resistors
8. Crystal Oscillator Circuit
9. Turning-on Sequence of Power Supply to A/D Converter and Analog Inputs
10. Connection of Unused Pins of A/D Converter if A/D Converter is used
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.
• If there are multiple V
• Connect V
• As a measure against power supply noise, connect a capacitor of about 0.1 F as a bypass capacitor between
The MB90340 Series does not support internal pull-up/down resistors (Port 0 to Port 3: built-in pull-up resistors).
Use external components where needed.
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 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.
Make sure to turn on the A/D converter power supply (AV
after turning-on the digital power supply (V
Turn-off the digital power after turning off the A/D converter supply and analog inputs. In this case, make sure
that the voltage not exceed AVRH or AV
is acceptable) .
Connect unused pins of A/D converter to AV
are connected the 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 V
and ground externally.
V
CC
and V
SS
CC
in the vicinity of V
and V
SS
CC
to the device from the current supply source at a low impedance.
and V
CC
/V
SS
SS
CC
)
pins, from the point of view of device design, pins to be of the same potential
and V
Vss
Vcc
Vss
CC
SS
Vcc
MB90340
(turning on/off the analog and digital power supplies simultaneously
CC
pins of the device
CC
Series
) .
V
CC
Vcc
, AV
Vss
Vcc
Vss
SS
CC
, AVRH, AVRL) and analog inputs (AN0 to AN23)
AVRH
AVRL
Vcc
Vss
CC
V
and V
SS
.
SS
pins to the power supply