FUJITSU F2MCTM-16LX User Manual

Page 40

CHAPTER 1 OVERVIEW

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Notes on Energization

To prevent malfunction of the internal voltage regulator, supply voltage profile while turning on the power

supply should be slower than 50

µs from 0.2 V to 2.7 V.

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Stabilization of

power supply voltage

If the power supply voltage varies acutely even within the operation assurance range of the V

power

supply voltage, a malfunction may occur. The V

power supply voltage must therefore be stabilized. As

stabilization guidelines, stabilize the power supply voltage so that V

ripple fluctuations (peak to peak

value) in the commercial frequencies (50 to 60 Hz) fall within 10% of the standard V

power supply

voltage and the transient fluctuation rate becomes 0.1 V/ms or less in instantaneous fluctuation for power

supply switching.

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Note on using CAN Function

The MB90360 series does not contain the clock modulation function. So, at using CAN, the DIRECT bit of

the CAN direct mode register (CDMR) must be set "1". (See Table 1.7-1 ). If the DIRECT bit is not set

correctly, the device does not operate normally.

Note:

For details on the clock modulation, see "CHAPTER 6 CLOCK SUPERVISOR".

Table 1.7-1 Setting of Clock Modulation and CAN Direct Mode

Clock modulation setting

(CMCR:PMOD bit)

CAN direct mode setting

(setting of CDMR:DIRECT bit)

Required setting

0: Disable clock modulation
(initial value)

1: Enable CAN direct mode

Setting disabled

1: Enable clock modulation

0: Disable CAN direct mode
(initial value)