AT89C5122D-RDRUM datasheet(181/208 Pages) ATMEL

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181

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Figure 109.

Example of a Suspend/Resume Management

Warning:

The core must be switched in external clock mode before disabling the PLL.

Smart Card Interface

Entering in Power-down Mode

In order to reduce the power consumption, a power-down or idle mode can be invoked

by software (see Table 13, PCON register). Before activating these modes the applica-

tion will need to:

Power-off the Smart Card Interface by applying the following sequence:

•

Set CRST pin at low level by clearing the bit CARDRST in SCCON register.

•

Set CCLK pin at low level by clearing the bit CLK then the CARDCLK in SCCON

•

Set CIO pin at low level by clearing the bit UART in SCICR register then the bit

CARDIO in SCCON register.

•

Power the Smart Interface off by clearing the CARDVCC bit in SCCON register. This

instruction enables to switch DC/DC converter off.

CPRES input:

•

Set the bit PRSEN in ISEL register

•

Set the bit EX1 in IE0 register

•

Set the bit EA in the IE0 register

•

Invert the bit CPLEV in ISEL register (INT1 interrupt vector)

•

Clear the bit PRESIT in the ISEL register

USB Controller Init

Detection of a SUSPEND State

SPINT

Set SUSPCLK

Disable PLL

microcontroller in power-down

Detection of a RESUME State

WUPCPU

Enable PLL

Clear SUSPCLK

Clear WUPCPU bit

Clear SPINT

Note :

WUPCPU bit must be

Cleared before enabling

the PLL

Put the USB pads

in power down mode

AT89C5122D-RDRUM Datasheet(PDF) 181 Page - ATMEL Corporation

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