TDA8029HLSLASHC2 datasheet(12/58 Pages) PHILIPS

12 / 58 page

2003 Oct 30

Philips Semiconductors

Product speciﬁcation

Low power single card reader

TDA8029

this mode. The Idle mode can be terminated either by any

enabled interrupt (at which time the process is picked up

at the interrupt service routine and continued), or by a

hardware reset which starts the processor in the same

manner as a Power-on reset.

Power-down mode: To save even more power, a

Power-down mode can be invoked by software. In this

mode, the oscillator is stopped and the instruction that

invoked Power-down is the last instruction executed.

Either a hardware reset, external interrupt or reception

on RX can be used to exit from Power-down mode. Reset

redefines all the SFRs but does not change the on-chip

RAM. An external interrupt allows both the SFRs and the

on-chip RAM to retain their values.

With INT0_N, INT1_N or RX, the bits in register IE must be

enabled. Within the INT0_N interrupt service routine, the

controller has to read out the Hardware Status Register

(HSR @ 0Fh) and/or the UART Status register

(USR @ 0Eh) by means of MOVX-instructions in order to

know the exact interrupt reason and to reset the interrupt

source.

For enabling a wake up by INT1_N, the bit ENINT1 within

UCR2 must be set.

For enabling a wake up by RX, the bits ENINT1 and ENRX

within UCR2 must be set.

An integrated delay counter maintains internally INT0_N

and INT1_N LOW long enough to allow the oscillator to

restart properly, so a falling edge on pins RX, INT0_N and

INT1_N is enough for awaking the whole circuit.

Once the interrupt is serviced, the next instruction to be

executed after RETI will be the one following the

instruction that put the device into power-down.

Table 3

External pin status during Idle and Power-down mode

MODE

PROGRAM MEMORY

ALE

PSEN_N

PORT 0

PORT 1

PORT 2

PORT 3

Idle

internal

data

external

ﬂoat

data

address

data

Power-down

internal

data

external

ﬂoat

data

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