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參數資料
| 型號： | MB90F962S |
| 廠商： | Fujitsu Limited |
| 英文描述： | 16-bit Microcontroller |
| 中文描述： | 16位微控制器 |
| 文件頁數： | 14/51頁 |
| 文件大?。?/td> | 790K |
| 代理商： | MB90F962S |
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MB90960 Series
14
4.
Notes on during operation of 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.
5.
Power supply pins (V
CC
/V
SS
)
If there are multiple V
CC
and V
SS
pins, from the point of view of device design, pins to be of the same potential
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 to keep the recommended DC characteristics specified as the total output current, be sure to connect the
V
CC
and V
SS
pins to the power supply and ground externally.
Connect V
CC
and V
SS
to the device from the power supply source with lowest possible impedance.
It is recommended to connect a capacitor of about 0.1
μ
F as a bypass capacitor between V
CC
and V
SS
in the
vicinity of V
CC
and V
SS
pins of the device.
6.
Pull-up/down resistors
The MB90960 series does not support internal pull-up/down resistors (except Port 2 : programmable pull-up
resistors) . Use pull-up/down handling where needed.
7.
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 artwork surrounding X0 and X1 pins with a ground area for
stabilizing the operation.
8.
Turning-on sequence of power supply to A/D converter and analog inputs
Make sure to turn on the A/D converter power supply (AV
CC
, AVR) and analog inputs (AN0 to AN15) after turning-
on the digital power supply (V
CC
) . Turn-off the digital power supply after turning off the A/D converter power
supply and analog inputs. In this case, make sure that the voltage does not exceed AVR or AV
CC
(turning on/off
the analog and digital power supplies simultaneously is acceptable) .
9.
Connection of unused pins of A/D converter if A/D converter is not used
Connect unused pins of A/D converter to AV
CC
=
V
CC
, AV
SS
=
AVR
=
V
SS
.
V
CC
V
SS
V
CC
V
CC
V
CC
V
CC
V
SS
V
SS
V
SS
V
SS
MB90960
S
erie
s
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