MB90233 Просмотр технического описания (PDF) - Fujitsu

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MB90233

16-bit Proprietary Microcontroller

Fujitsu 

MB90230 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- to high-voltage pins or if higher than the voltage wihich 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 power supply (AVCC and AVR) and analog input from exceeding the digital

power supply (VCC) when the analog system power supply is turned on and off.

2. Treatment of Unused Pins

Leaving unused input pins open could cause malfunctions. They should be connected to a pull-up or pull-down

resistor.

3. External Reset Input

To reset the internal circuit by the Low-level input to the RST pin, the Low-level input to the RST pin must be

maintained for at least five machine cycles. Pay attention to it if the chip uses external clock input.

4. VCC and VSS Pins

Apply equal potential to the VCC and VSS pins.

5. Notes on Using an External Clock

When using an external clock, drive the X0 pin as illustrated below:

Use of External Clock

X0 MB90234

X1

6. Power-on Sequence for A/D Converter Power Supplies and Analog Inputs

Be sure to turn on the digital power supply (VCC) before applying voltage to the A/D converter power supplies

(AVCC, AVRH, and AVRL) and analog inputs (AN0 to AN15).

When turning power supplies off, turn off the A/D converter power supplies (AVCC, AVRH, and AVRL) and analog

inputs (AN0 to AN15) first, then the digital power supply (AVCC).

When turning AVRH on or off, be careful not to let it exceed AVCC.

7. Pin set when turning on power supplies

When turning on power supplies, set the hardware standby input pin (HST) to “H”.

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