參數(shù)資料
型號(hào)： MB90M408PF
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 16-Bit Original Microcontroller
中文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100
封裝： 0.65 MM PITCH, PLASTIC, QFP-100
文件頁(yè)數(shù)： 12/64頁(yè)
文件大?。?/td> 310K
代理商： MB90M408PF
MB90M405 Series
12
Power supply pin
When there are multiple V
CC
/V
SS
, in order to prevent latch-ups and other malfunctions, then from design
considerations, although pins of the same potential are connected device-internally, make sure to connect the
V
CC
and V
SS
pins to power and grounds, in order to reduce unneeded radiation, and prevent strobe signal
malfunctions due to rises in ground level.
Connect V
CC
and V
SS
to MB90M405 series devices from a current supply source at low impedance.
Connect an approximately 0.1
μ
F capacitor as a bypass capacitor between the V
CC
and V
SS
, near the V
CC
and
Vss pins, in order to combat power-source noise in MB90M405 series devices.
Crystal Oscillation Circuit
Noise to the X0 and X1 pins can cause MB90M405 series devices to malfunction. Design the printed circuit
board so that pins X0 and X1, and the crystal oscillator (or ceramic oscillator) and the capacitor to the ground,
are near pins X0 and X1, and not crossing the X0 and X1, or other wiring.
Stable operation can be expected from PCB artwork that surrounds pins X0 and X1 with grounds.
Sequence for applying power analog input of A/D converter
Always make sure to apply voltage to the digital power pin (V
CC
) before applying voltage to the A/D converter
power pin (AV
CC
) and analog input pins (AN0 to AN15) .
When shutting off the power, shut off digital power (V
CC
) after shutting off A/D converter power and analog input.
If a port pin also used for analog input is used as an input port, make sure that the analog input voltage does
not exceed AV
CC
(there is no problem with simultaneously applying and cutting analog and digital power) .
Pin handling when not using A/D converter
When not using the A/D converter, connect so that AV
CC
=
V
CC
and AV
SS
=
V
SS
.
Output of high-voltage resistance output pin (circuit types C & D)
If using high voltage-resistance output (circuit types C & D) as the ordinary output port, when outputting “L” level,
a value of pull-down for V
KK
pin voltage is output. In this case, the V
KK
level voltage is applied to the external
circuit, so add a diode clamp circuit as shown in the figure below:
Notes on PLL clock mode
If the oscillator is disconnected, or clock input stops, when the PLL clock is selected on the microcontroller, the
microcontroller may continue to operate, using the free-run frequency of the PLL-internal self-exciting oscillation
circuit. This operation is not guaranteed.
V
KK
R
KK
Pout
Pch
Diode clamp circuit
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