TDA8029HLSLASHC2 datasheet(37/58 Pages) PHILIPS

37 / 58 page

2003 Oct 30

Philips Semiconductors

Product speciﬁcation

Low power single card reader

TDA8029

Table 57 Description of register bits

BIT

SYMBOL

DESCRIPTION

ENINT1

Enable INT1. If ENINT1 = 1, a HIGH to LOW transition on pin INT1_N will

wake-up the TDA8029 from the Power-down mode. Note that in case of

reception of a character when in Power-down mode, the start of the frame

will be lost. When not in Power-down mode ENINT1 has no effect. For

details on Power-down mode see Section 8.15.

DISTBE/RBF

Disable TBE/RBF interrupts. If DISTBE/RBF is set, then reception or

transmission of a character will not generate an interrupt. This feature is

useful for increasing communication speed with the card; in this case, the

copy of TBE/RBF bit within MSR must be polled, and not the original, in

order not to loose priority interrupts which can occur in USR.

−

Not used.

ENRX

Enable RX. If ENRX = 1, a HIGH to LOW transition on pin RX will wake-up

the TDA8029 from the Power-down mode. Note that in case of reception of

a character when in Power-down mode, the start of the frame will be lost.

When not in Power-down mode ENRX has no effect. For details on

Power-down mode see Section 8.15.

SAN

Synchronous/Asynchronous. SAN is set by software if a synchronous

card is expected. The UART is then bypassed and only bit 0 in registers

URR and UTR is connected to pin I/O. In this case the clock is controlled by

bit SC in register CCR.

AUTOCONV

Automatic set convention. If AUTOCONV = 1, then the convention is set

by software using bit CONV in register UCR1. If AUTOCONV = 0, then the

configuration is automatically detected on the first received character whilst

the start session (bit SS) is set. AUTOCONV must not be changed during a

card session.

CKU

Clock Unit. For baud rates other than those given in Table 58, there is the

possibility to set bit CKU = 1. In this case, the ETU will last half the number

of card clock cycles equal to prescaler PDR. Note that bit CKU = 1 has no

effect if fCLK =fXTAL. This means, for example, that 76800 baud is not

possible when the card is clocked with the frequency on pin XTAL1.

PSC

Prescaler value. If PSC = 1, then the prescaler value is 32; if PSC = 0,

then the prescaler value is 31. One ETU will last a number of card clock

cycles equal to prescaler

× PDR. All baud rates specified in ISO 7816 norm

are achievable with this configuration. See Fig.10 and Table 58.

handbook, full pagewidth

FCE872

÷ 31 OR 32

÷ PDR

ETU

MUX

CLK

CKU

× CLK

Fig.10 ETU generation.

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