MB90F654A FUJITSU [Fujitsu Component Limited.], MB90F654A Datasheet - Page 17
MB90F654A
Manufacturer Part Number
MB90F654A
Description
16-bit Proprietary Microcontroller
Manufacturer
FUJITSU [Fujitsu Component Limited.]
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8. Initializing
9. Power Supply Pins
10.Crystal Oscillation Circuit
11. About 2 Power Supplies
In this device there are some kinds of inner resisters which are initializid only by power on reset. It is possible
to initialize these resisters by turning on the power supply again.
When there are several V
within the device when the device is designed in order to prevent misoperation, such as latchup. However, all
of those pins must be connected to the power supply and ground externally in order to reduce unnecessary
emissions, prevent misoperation of strobe signals due to an increase in the ground level, and to observe the
total output current standards.
In addition, give a due consideration to the connection in that current supply be connected to V
the lowest possible impedance.
Finally, it is recommended to connect a capacitor of about 0.1 F between V
bypass capacitor.
Noise in the vicinity of the X0 and X1 pins will cause this device to operate incorrectly. Design the printed circuit
board so that the bypass capacitor connecting X0, X1 and the crystal oscillator (or ceramic oscillator) to ground
is located as close to the device as possible, and that the wiring does not closs the other wirings.
In addition, because printed circuit board artwork in which the area around the X0 and X1 pins is surrounded
by ground provides stable operation, such an arrangement is strongly recommended.
The MB90650A series usually uses the 3-V power supply as the main power source. With Vcc1 = 3 V and Vcc2
= 5 V, however, it can interface with P20 to P27, P30 to P37, P40 to P47, and P70 to P72 for the 5-V power
supply separately from the 3-V power supply. Note, however, that the analog power supplies such as A/D and
D/A can be used only as 3-V power supplies.
CC
and V
SS
pins, those pins that should have the same electric potential are connected
MB90650A Series
CC
and V
SS
near this device as a
CC
and V
SS
with
17
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