AT90SCR100 datasheet(47/433 Pages) ATMEL

47 / 433 page

TPR0327AY–SMS–30Jan09

AT90SCR100

Writing a logic one to this bit shuts down the Keyboard module by stopping the clock to the mod-

ule. When waking up the Keyboard again, the Keyboard should be re initialized to ensure proper

operation.

• Bit 4 - PRAES: Power Reduction AES

Writing a logic one to this bit shuts down the AES module by stopping the clock to the module.

When waking up the AES again, the AES should be re initialized to ensure proper operation.

• Bit 3 - PRSCI: Power Reduction Smart Card Interface

Writing a logic one to this bit shuts down the Smart Card Interface module by stopping the clock

to the module. When waking up the SCIB again, the SCIB should be re initialized to ensure

proper operation.

• Bit 2 - PRHSSPI: Power Reduction High Speed SPI

Writing a logic one to this bit shuts down the High Speed Serial Peripheral Interface by stopping

the clock to the module. When waking up the HSSPI again, the HSSPI should be re initialized to

ensure proper operation.

• Bit 1 - PRUSB: Power Reduction USB

Writing a logic one to this bit shuts down the USB by stopping the clock to the module. When

waking up the USB again, the USB should be reinitialized to ensure proper operation.

• Bit 0 - PRUSBH: Power Reduction USB Host Controller

Writing a logic one to this bit shuts down the USB Host Controller by stopping the clock to the

module. When waking up the USB Host Controller again, the USB Host module should be reini-

tialized to ensure proper operation.

8.3

Important note about: Entering and Leaving low consumption modes

8.3.1

Entering Power Down

It is very important to note that there is no automatic switch to a low consumption mode for the

PLL Clock Multiplexer and for the DC/DC converter.

• To lower the powerdown consumption, the PLL Clock Multiplexer must be switched to

External Clock and the PLL must be stopped. To do so:

– Switch from PLL to External Clock by clearing PLLCR.PLLMUX.

– Turn the PLL off by clearing PLLCR.ON.

– Wait until PLLCR.LOCK bit is cleared.

• To lower the powerdown consumption, the DC/DC converter must also be switched off. To do

so:

– Clear DCCR.DCON bit. This will generate a deactivation sequence.

Enabling the ‘Power Reduction USB Host Controller’ prevents the device from

communicating with USB smart cards.

However, if the Smart Card Interface is ON, communication with standard smart

cards (ISO7816 1-3) is still possible.

To optimize the power consumption, if the application does not target USB Smart

Card, the USB Host Controller should be disabled this way.

Note

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