ST7SCR1E4 datasheet(68/102 Pages) STMICROELECTRONICS

68 / 102 page

ST7SCR

68/102

SMARTCARD INTERFACE (Cont’d)

SMARTCARD INTERRUPT PENDING REGIS-

TER (CRDIPR)

Read Only

Reset Value: 0000 0000 (00h)

This register indicates the interrupt source. It is

cleared after a read operation.

Bit 7 = TXBEP

Transmit buffer empty interrupt

pending.

This bit is set by hardware when a TXBE event oc-

curs and the TXBEM bit is set.

0: No TXBE interrupt pending

1: TXBE interrupt pending

Bit 6 = Reserved.

Bit 5 = IOVF

Card Overload Current interrupt

pending.

This bit is set by hardware when a IOVF event oc-

curs and the IOVFM bit is set.

0: No IOVF interrupt pending

1: IOVF interrupt pending

Bit 4 = VCRDP

Card Voltage Error interrupt pend-

ing.

This bit is set by hardware when the VCARDOK bit

goes from 1 to 0 while the VCRDM bit is set.

0: No VCRD interrupt pending.

1: VCRD interrupt pending.

Bit 3 = WTP

Waiting Timer Overflow interrupt

pending.

This bit is set by hardware when a WTP event oc-

curs and the WTPM bit is set.

0: No WT interrupt pending

1: WT interrupt pending

Bit 2 = TXCP

Transmitted character interrupt

pending.

This bit is set by hardware when a character is

transmitted and the TXCM bit is set. It indicates

that the CRDTXB buffer can be loaded with the

next character to be transmitted.

0: No TXC interrupt pending

1: TXC interrupt pending

Bit 1 = RXCP

Received character interrupt pend-

ing.

This bit is set by hardware when a character is re-

ceived and the RXCM bit is set. It indicates that the

CRDRXB buffer can be read.

0: No RXC interrupt pending

1: RXC interrupt pending

Bit 0 = PARP

Parity Error interrupt pending.

This bit is set by hardware when a PAR event oc-

curs and the PARM bit is set.

0: No PAR interrupt pending

1: PAR interrupt pending

SMARTCARD TRANSMIT BUFFER (CRDTXB)

Read/Write

Reset Value: 0000 0000 (00h)

This register is used to send a byte to the smart-

card.

SMARTCARD RECEIVE BUFFER (CRDRXB)

Read

Reset Value: 0000 0000 (00h)

This register is used to receive a byte from the

smartcard.

TXBE

-IOVF

VCRD

WTP

TXCP

RXC

PAR

TB7

TB6

TB5

TB4

TB3

TB2

TB1

TB0

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0

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