TDA8006HSLASHC2 datasheet(21/40 Pages) PHILIPS

21 / 40 page

2000 Feb 21

Philips Semiconductors

Product speciﬁcation

Multiprotocol IC Card coupler

TDA8006

handbook, full pagewidth

MGR234

P40

CLK

I/O

R/W

read

write

Fig.10 Using synchronous cards.

EXTRA GUARD TIME

Between the transmission of two characters to the card,

the ISO 7816 UART automatically inserts a number of

guard ETUs equal to the value, called GT, stored in the

GTR, see Table 10. For a GT of FAH, for example, the

value would be 1111 1010 reading from D7 to D0.

A GT of FFH has a special status which means 0 ETU

when the protocol is T = 0 and

−1 ETU when the protocol

is T = 1 (reception and transmission is possible at

11 ETU).

Table 10 Guard Time Register (GTR; address 6; write only; all bits cleared after reset)

GUARD TIME VALUE (GT)

n7n6n5n4 n3n2n1n0

UART receive and transmit registers

UART Receive Register (URR; address 4; read only; all

bits cleared after reset)

D7 to D0 are the data bits received from the card.

Because the UART automatically converts the characters

according to the convention recognized during TS, all

characters in the URR are in direct convention.

• The received character is loaded in the URR 0.5 ETU

after the parity shift, i.e. 10.5 ETU after the edge of the

start bit. This overwrites the previous character which

should have been read by the controller.

• The UART checks the parity of the received characters;

if the parity is wrong, then bit PE is set in the status

Full).

• In protocol T = 0, I/O is pulled LOW between

10.5 and 11.75 ETU in case of error. Characters may be

received from the card every 12 ETU, even after a

transmission (see LCT; Table 9). In protocol T = 1,

reception is possible at 11 ETU.

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