Rainbow-electronics AT83C26 Manual de usuario descargar pdf (Pagina 27)

7511B–SCR–10/05

AT83C26

The CRST signal will be equal to 0 during the number of clock cycles programmed in

TIMER_MSB and TIMER_LSB. Then, the CRST signal will be at 1.

Figure 16. Warm reset with ARTn bit = 1

Deactivation Sequence Overview

The deactivation sequence should follows the order defined in ISO7816-3 specification. The

AT83C26 has two deactivation modes:

• Standard deactivation mode: This mode is used to stop exchange with smart card when the

AT83C26 power supply is present. The DCCLK signal is used for deactivation sequence

timings.

• Emergency deactivation mode: This mode is used when the AT83C26 power supply is took

off.

Deactivation sequence on SCn interface (n=1, 2, 3, 4, 5)

The card automatic deactivation is triggered when one the following condition occurs:

• ICARDERR1 bit is set by hardware (SC1)

• VCARDERRn bit is set by hardware (or by software)

• INSERT1 is set and CARDIN1 is cleared (SC1)

• INSERT2 is set and CARDIN2 is cleared (SC2)

• SHUTDOWNA bit is set by software (SC1)

• SHUTDOWNB bit is set by software (SC2, SC3, SC4, SC5)

CVCCn

CRSTn

CCLKn

CIOn

ART = 1

t = TIMER value

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 76 77

Sin comentarios

Rainbow-electronics AT83C26 Manual de usuario Pagina 27