ST7SCR datasheet(63/102 Pages) STMICROELECTRONICS

63 / 102 page

ST7SCR

63/102

SMARTCARD INTERFACE (Cont’d)

SMARTCARD INTERFACE STATUS REGISTER

(CRDSR)

Read only (Read/Write on some bits)

Reset Value: 1000 0000 (80h)

Bit 7 =TxBEF

Transmit Buffer Empty Flag.

- Read only

0: Transmit buffer is not empty

1: Transmit buffer is empty

Bit 6 = CRDIRF

Card Insertion/Removal Flag.

- Read only

0: No card is present

1: A card is present

Bit 5 = IOVF

Card Overload Current Flag.

- Read only

0: No card overload current

1: Card overload current

Bit 4 = VCARDOK

Card voltage status Flag.

- Read only

0: The card voltage is not in the specified range

1: The card voltage is within the specified range

Bit 3 = WTF

Waiting Time Counter overflow Flag.

- Read only

0: The WT Counter has not reached its maximum

value

1: The WT Counter has reached its maximum val-

Bit 2 = TXCF

Transmitted character Flag.

- Read/Write

This bit is set by hardware and cleared by soft-

ware.

0: No character transmitted

1: A character has been transmitted

Bit 1 = RXCF

Received character Flag.

- Read only

This bit is set by hardware and cleared by hard-

ware when the CRDRXB buffer is read.

0: No character received

1: A character has been received

Bit 0 = PARF

Parity Error Flag.

- Read/Write

This bit is set by hardware and cleared by soft-

ware.

0: No parity error

1: Parity error

Note: When a character is received, the RXCF bit

is always set.When a character is received with a

parity error, the PARF bit is also set.

TXBE

CRD

IRF

IOVF

VCARD

WTF

TXC

RXC

PAR

ST7SCR Datasheet(PDF) 63 Page - STMicroelectronics

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