TDA8029HLSLASHC2 datasheet(28/58 Pages) PHILIPS

28 / 58 page

2003 Oct 30

Philips Semiconductors

Product speciﬁcation

Low power single card reader

TDA8029

8.10.1

GENERAL REGISTERS

8.10.1.1

Card Select Register (CSR)

This register is used for resetting the ISO UART.

Table 32 Card select register, address 0h, read and write

Table 33 Description of register bits

8.10.1.2

Hardware Status Register (HSR)

This register gives the status of the chip after a hardware problem has been signalled or when pin SDWN_N has been

activated.

When PRTL1, PRL1, PTL or SDWN is logic 1, then pin INT0_N is LOW. The bits having caused the interrupt are cleared

when HSR is read (two fint cycles after the rising edge of signal RD).

In case of emergency deactivation by PRTL1, SUPL, PRL1 and PTL, bit START in the power control register is

automatically reset by hardware.

Table 34 Hardware Status Register, address Fh, read

Table 35 Description of register bits

BIT

543210

Symbol

−−

−

RIU

−−−

Reset value

00000

BIT

SYMBOL

DESCRIPTION

7to4

−

Not used.

RIU

Reset ISO UART. If RIU = 0, this bit resets a large part of the UART registers to their

initial value. Bit RIU must be reset to logic 0 for at least 10 ns duration before any

activation. Bit RIU must be set to logic 1 by software before any action on the UART can

take place.

2to0

−

Not used.

BIT

543210

Symbol

SDWN

−

PRTL1

SUPL

−

PRL1

−

PTL

Reset value

−

0000000

BIT

SYMBOL

DESCRIPTION

7SDWN

Enter shut-down mode. This bit is used for entering the shut-down mode. SDWN is set

when the SDWN_N pin is active (LOW). When the software reads the status, it must:

• Deactivate the card if active

• Set all ports to logic 1 (for minimizing the current consumption)

• Inhibit the interrupts

• Go to Power-down mode.

The same must be done when the chip is powered-on with SDWN_N pin active.

The only way to leave shut-down mode is when pin SDWN_N is HIGH.

−

Not used.

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