參數(shù)資料
型號： MB90F523BPFV
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP120
封裝： PLASTIC, QFP-120
文件頁數(shù)： 10/99頁
文件大小： 978K
代理商： MB90F523BPFV
MB90520A/520B Series
18
Connection of a bypass capacitor of approximately 0.1
F between VCC and VSS is recommended to prevent
power supply noise. Connect the capacitor close to the VCC and VSS pins.
Crystal oscillator circuit
Noise on the X0 and X1 pins can be a cause of device misoperation. Place the X0 and X1 pins, crystal oscillator
(or ceramic oscillator) , and bypass capacitor to ground as close together as possible. Also, design the circuit
board so that the X0 and X1 pin wiring does not cross other wiring.
Surrounding the X0/X1 and X0A/X1A pins with ground in the printed circuit board design is recommended to
ensure stable operation.
Notes on using an external clock
When using an external clock, drive the X0 pin only and leave the X1 pin open.
The figure below shows an example of how to use an external clock.
Precautions when not using sub-clock mode
Connect an oscillator to X0A and X1A, even if not using sub-clock mode.
Treatment of unused pins
Leaving unused input pins unconnected can cause misoperation or permanent damage to the device due to
latchup. Always pull-up or pull-down unused pins using a 2 k
or larger resistor.
If some I/O pins are unused, either set as outputs and leave open circuit or set as inputs and treat in the same
way as input pins.
Treatment of N.C. pins
Always leave N.C. (non connect) pins open circuit.
Treatment of pins when A/D converter not used
When not using the A/D converter and D/A converter, always connect AVCC
= DVCC = AVRH = VCC and AVSS =
AVRL
= VSS.
Sequence for connecting and disconnecting the A/D converter power supply and analog input pins
Do not apply voltage to the A/D and D/A converter power supply (AVCC, AVRH, AVRL, DVCC, DVSS) or analog
inputs (AN0 to AN7) until the digital power supply (VCC) is turned on.
When turning the device off, turn off the digital power supply after disconnecting the A/D converter power
supply and analog inputs. When turning the power on or off, ensure that AVRH and DVCC do not exceed AVCC
(turning the analog and digital power supplies on and off simultaneously is OK) .
Shared use of general-purpose I/O ports and LCD controller/driver SEG/COM pins
The SEG08 to SEG31 and COM0 to COM3 pins are shared with general-purpose I/O ports. The electrical
ratings for SEG08 to SEG23 and COM0 to COM3 are the same as for CMOS outputs and the electrical ratings
for SEG24 to SEG31 are the same as for N-ch open-drain ports.
X0
Open circuit
MB90520A/520B series
X1
Example of how to use an external clock
相關(guān)PDF資料
PDF描述
MB90522APFF 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP120
MB90523APFF 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP120
MB90522BPFV 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP120
MB90522APFV 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP120
MB90523APFV 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP120
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