MB91F109 データシートの表示（PDF） - Fujitsu

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MB91F109

32-bit RISC Microcontroller

Fujitsu 

MB91F109

s HANDLING DEVICES

1. Preventing Latchup

In CMOS ICs, applying voltage higher than VCC or lower than VSS to input/output pin or applying voltage over

rating across VCC and VSS may cause latchup.

This phenomenon rapidly increases the power supply current, which may result in thermal breakdown of the

device. Make sure to prevent the voltage from exceeding the maximum rating.

Take care that the analog power supply (AVCC, AVRH) and the analog input do not exceed the digital power

supply (VCC) when the analog power supply turned on or off.

2. Treatment of Unused Pins

Unused pins left open may cause malfunctions. Make sure to connect them to pull-up or pull-down resistors.

3. External Reset Input

It takes at least 5 machine cycle to input “L” level to the RST pin and to ensure inner reset operation properly.

4. Remarks for External Clock Operation

When external clock is selected, supply it to X0 pin generally, and simultaneously the opposite phase clock to

X0 must be supplied to X1 pin. However, in this case the stop mode must not be used (because X1 pin stops

at “H” output in stop mode).

And can be used to supply only to X0 pin with 5 V power supply at 12.5 MHz and less than.

• Using an external clock

X0

X1

MB91F109

Using an external clock (normal)

Note: Can not be used stop mode (oscillation stop mode).

Open

X0

X1

MB91F109

Using an external clock (can be used at 12.5 MHz and less than.)

(3.3 V power supply only)

16

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