TDA8029HLSLASHC2 datasheet(33/58 Pages) PHILIPS

33 / 58 page

2003 Oct 30

Philips Semiconductors

Product speciﬁcation

Low power single card reader

TDA8029

8.10.2.3

Mixed Status Register (MSR)

This register relates the status of the card presence contact PR1, the BGT counter, the FIFO empty indication, the

transmit/receive ready indicator TBE/RBF and the completion of clock switching to or from 1/2fint.

No bit within register MSR act upon INT0_N.

Table 48 Mixed status register, address Ch, read

Table 49 Description of register bits

BIT

543210

Symbol

CLKSW

BGT

−−

PR1

−

TBE/RBF

Reset value

−

−−−

BIT

SYMBOL

DESCRIPTION

CLKSW

Clock Switch. CLKSW is set when the TDA8029 has performed a required clock switch

from 1/nfXTAL to 1/2fint and is reset when the TDA8029 has performed a required clock

switch from 1/2fint to 1/nfXTAL. The application shall wait this bit before entering

power-down mode or restarting sending commands after leaving power-down (only

needed when the clock is not stopped during power-down). This bit is also reset by RIU

and at power-on. When the microcontroller wants to transmit a character to the card, it

writes the data in direct convention to this register.

6FE

FIFO Empty. FE is set when the reception FIFO is empty. It is reset when at least one

character has been loaded in the FIFO.

BGT

Block Guard Time.

In T = 1 protocol, the bit BGT is linked with a 22 ETU counter, which is started at every

start-bit on pin I/O. If the count is ﬁnished before the next start-bit, BGT is set. This helps

checking that the card has not answered before 22 ETU after the last transmitted

character, or that the reader is not transmitting a character before 22 ETU after the last

received character.

In T = 0 protocol, the bit BGT is linked to a 16 ETU counter, which is started at every

start-bit on I/O. If the count is ﬁnished before the next start-bit, then the bit BGT is set.

This helps checking that the reader is not transmitting too early after the last received

character.

4 and 3

−

Not used.

PR1

Presence 1. PR1 = 1 when the card is present.

−

Not used.

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