ST7SCR datasheet(67/101 Pages) STMICROELECTRONICS

67 / 101 page

ST7SCR

67/101

SMARTCARD INTERFACE (Cont’d)

SMARTCARD ELEMENTARY TIME UNIT REG-

ISTER (CRDETUx)

CRDETU1

Read/Write

Reset Value: 0000 0001 (01h)

Bit 7 = COMP Elementary Time Unit Compensa-

tion.

0: Compensation mode disabled.

1: Compensation mode enabled. To allow non in-

teger value, one clock cycle is subtracted from

the ETU value on odd bits. See Figure 32.

Bit [6:3] = Reserved

Bits 2:0 = ETU [10:8] ETU value in card clock cy-

cles.

Writing CRDETU1 register reloads the ETU coun-

ter.

CRDETU0

Read/Write

Reset Value: 0111 0100 (74h)

Bits 7:0 = ETU [7:0] ETU value in card clock cy-

cles.

Note: The value of ETU [10:0] must in the range

12 to 2047. To write 2048, clear all the bits.

GUARDTIME REGISTER (CRDGTx)

CRDGT1

Read/Write

Reset Value: 0000 0000 (00h)

CRDGT0

Read/Write

Reset Value: 0000 1100 (0Ch)

Software writes the Guardtime value in this regis-

ter. The value is loaded at the end of the current

Guard period.

GT: Guard Time: Minimum time between two con-

secutive start bits in transmission mode. Value ex-

pressed in Elementary Time Units (from 11 to

511).

The Guardtime between the last byte received

from the card and the next byte transmitted by the

reader must be handled by software.

COMP

ETU10

ETU9

ETU8

ETU7

ETU6

ETU5

ETU4

ETU3

ETU2

ETU1

ETU0

GT8

GT7

GT6

GT5

GT4

GT3

GT2

GT1

GT0

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