T83C5121XXX-ICSIL datasheet(17/115 Pages) ATMEL

17 / 115 page

A/T8xC5121

4164G–SCR–07/06

The ports status under Power-down is the status which was valid before entering this

mode.

The INT1 interrupt is a multiplexed input (see Interrupt paragraph) with CPRES (Card

detection) and Rxd (UART Rx). So these three inputs can be used to exit from Power-

down mode. The configurations which must be set are detailed below:

•

Rxd input:

–

RXEN (ISEL.0) must be set

–

EX1 (IE0.2) must be set

–

A low level detected during more than 100 microseconds exit from Power-

down

•

CPRES input:

–

PRSEN (ISEL.1) must be set

–

EX1 (IEO.2) must be set

–

EA (IE0.7) must be set

–

In the INT1 interrupt vector, the CPLEV Bit (ISEL.7) must be inverted

and PRESIT Bit (ISEL.5) must be reset.

Figure 10. Power-down Exit Waveform

Exiting from Power-down by reset redefines all the SFRs, exiting from Power-down by

external interrupt does no affect the SFRs.

Exiting from Power-down by either reset or external interrupt does not affect the internal

RAM content.

Note:

If idle mode is activated with Power-down mode (IDL and PD bits set), the exit sequence

is unchanged, when execution is vectored to interrupt, PD and IDL bits are cleared and

idle mode is not entered.

SCI Control

Prior to entering Power-down mode, a de-activation of the Smart Card system must be

performed.

LED Control

Prior to entering Power-down mode, if the LED mode output is used, the medium pull-up

must be disconnected by setting the LEDPD bit in the PCON Register (PCON 3).

Low Power Mode

Only in Power-down mode, in order to reduce the power consumption, the user can

choose to select this low-power mode.

The activation reference is the following.

•

First select the Low-power mode by setting the LP bit in the AUXR Register (AUXR.

•

The activation of Power-down can then be done.

INT1

INT0

XTAL1

Power-down phase

Oscillator restart phase

Active phase

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