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MB89202

8-bit Proprietary Microcontroller F2MC-8L MB89202 Series

Fujitsu 

MB89202 Series

■ HANDLING DEVICES

• 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 “■ 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.

• 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 or if it is in an input state, handle it with the

same procedure as the input terminals.

• Treatment of N.C. Pins

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

• 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 Hz 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.

• 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.

• About the Wild Register Function

No wild register can be debugged on the MB89V201. For the operation check, test the MB89F202 installed on

a target system.

• Program Execution in RAM

When the MB89V201 is used, no program can be executed in RAM.

• 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).

• External pullup for the External Reset Pin (RST) of MB89F202

Internal pullup control for RST pin is not available for MB89F202. To ensure proper external reset control in

MB89F202, an external pullup (recommend 100 kΩ) for RST pin must be required.

(Continued)

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