MB89935B 데이터 시트보기 (PDF) - Fujitsu

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MB89935B

8-bit Proprietary Microcontroller

Fujitsu 

MB89930A Series

s HANDLING DEVICES

1. Preventing Latchup

Latchup may occur on CMOS ICs if voltage higher than VCC or lower than VSS is applied to input and output pins

other than medium- and high-voltage pins or if higher than the voltage which shows on “1. Absolute Maximum

Ratings” in section “s ELECTRICAL CHARACTERISTICS” is applied between VCC and VSS.

When latchup occurs, power supply current increases rapidly and might thermally damage elements. When

using, take great care not to exceed the absolute maximum ratings.

Also, take care to prevent the analog input from exceeding the digital power supply (VCC) when the analog system

power supply is turned on and off.

2. Treatment of Unused Input Pins

Leaving unused input terminals open may lead to permanent damage due to malfunction and latchup; pull up

or pull down the terminals through the resistors of 2 kΩ or more.

Make the unused I/O terminal in a state of output and leave it open and if it is in an input state, handle it with

the same procedure as the input terminals.

3. Treatment of N.C. Pins

Be sure to leave (internally connected) N.C. pins open.

4. Power Supply Voltage Fluctuations

Although VCC power supply voltage is assured to operate within the rated range, a rapid fluctuation of the voltage

could cause malfunctions, even if it occurs within the rated range. Stabilizing voltage supplied to the IC is therefore

important. As stabilization guidelines, it is recommended to control power so that VCC ripple fluctuations (P-P

value) will be less than 10% of the standard VCC value at the commercial frequency (50 to 60 Hz) and the transient

fluctuation rate will be less than 0.1 V/ms at the time of a momentary fluctuation such as when power is switched.

5. Treatment of Power Supply Pins on Microcontrollers with A/D Converters

Connect to be AVSS = VSS even if the A/D converters are not in use.

6. Precautions when Using an External Clock

When an external clock is used, oscillation stabilization time is required even for power-on reset (optional) and

wake-up from stop mode.

7. About the Wild Register Function

No wild register can be debugged on the MB89PV930A. For the operation check, test the MB89P935B installed

on a target system.

8. Program Execution in RAM

When the MB89PV930A is used, no program can be executed in RAM.

9. Note to Noise in the External Reset Pin (RST)

If the reset pulse applied to the external reset pin (RST) does not meet the specifications, it may cause malfunc-

tions. Use caution so that the reset pulse less than the specifications will not be fed to the external reset pin (RST).

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