參數(shù)資料
型號(hào)： MB90F488
廠商： Fujitsu Limited
英文描述： 16-bit Proprietary Microcontroller CMOS
中文描述： 16位微控制器專有的CMOS
文件頁數(shù)： 16/113頁
文件大?。?/td> 522K
代理商： MB90F488
MB90480/485 Series
16
6.
Notes on during operation of PLL clock mode
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.
7.
Proper power-on/off sequence
The A/D converter power (AV
CC
, AVRH) and analog input (AN0 to AN7) must be turned on after the digital power
supply (V
CC
) is turned on. The A/D converter power (AV
CC
, AVRH) and analog input (AN0 to AN7) must be shut
off before the digital power supply (V
CC
) is shut off. Care should be taken that AVRH does not exceed AV
CC
. Even
when pins used as analog input pins are doubled as input ports, be sure that the input voltage does not exceed
AV
CC
.
8.
Treatment of power supply pins on models with A/D converters
Even when the A/D converters are not in use, be sure to make the necessary connections AV
CC
=
AVRH
=
V
CC
,
and AV
SS
=
V
SS
.
9.
Precautions when turning the power supply on
In order to prevent abnormal operation in the chip’s internal step-down circuits, a voltage rise time during power-
on of 50
μ
s (0.2 V to 2.7 V) or greater should be assured.
10. Supply Voltage Stabilization
Even within the operating range of V
CC
supply voltage, rapid voltage fluctuations may cause abnormal operation.
As a standard for power supply voltage stability, it is recommended that the peak-to-peak V
CC
ripple voltage at
commercial supply frequency (50 Hz to 60 Hz) be 10
%
or less of V
CC
, and that the transient voltage fluctuation
be no more than 0.1 V/ms or less when the power supply is turned on or off.
11. Notes on Using Power Supply
Only the MB90485 series usually uses a 3 V power supply. By setting V
CC
3
=
3 V power supply and V
CC
5
=
5 V
power supply, P20 to P27, P30 to P37, P40 to P47 and P70 to P77 can be intefaced as 5 V power supplies
separately from the main 3 V power supply. Note that the analog power supplies (such as AV
CC
and AV
SS
) for
the A/D converter can be used only as 3 V power supplies.
Programming into FLASH memory must be performed at an operating voltage (V
CC
) between 3.13 V and 3.6 V.
12. Treatment of N.C. pins
N.C. (internally connected) pins should always be left open.
13. When the MB90480/485 series microcontroller is used as a single system
When the MB90480/485 series microcontroller is used as a single system, use connections so the X0A
=
V
SS
,
and X1A
=
Open.
14. Writing to FLASH memory
For serial writing to FLASH memory, always ensure that the operating voltage V
CC
is between 3.13 V and 3.6 V.
For normal writing to FLASH memory, always ensure that the operating voltage V
CC
is between 3.0 V and 3.6 V.
相關(guān)PDF資料
PDF描述
MB90F488PF 16-bit Proprietary Microcontroller CMOS
MB90F488PFV 16-bit Proprietary Microcontroller CMOS
MB90495G 16-bit Proprietary Microcontroller CMOS
MB90540 16-bit Proprietary Microcontroller
MB90543GSPF 16-bit Proprietary Microcontroller
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