TDA8029HLSLASHC2 datasheet(26/58 Pages) PHILIPS

26 / 58 page

2003 Oct 30

Philips Semiconductors

Product speciﬁcation

Low power single card reader

TDA8029

handbook, full pagewidth

MCE651

512-BYTE

XRAM

MOVX

EXTERNAL

DATA

MEMORY

UPPER

128-BYTE

INTERNAL

RAM

LOWER

128-BYTE

INTERNAL

RAM

SPECIAL

FUNCTION

REGISTERS

FFFFh

200h

00h

80h

FFh

00h

80h

FFh

00h

1FFh

Fig.9 Internal and external data memory address space with EXTRAM = 0.

8.6.1

AUXILIARY REGISTER (AUXR)

Table 29 Auxiliary register bits

Table 30 Description of register bits

Note

1. Do not write logic 1s to reserved bits. These bits may be used in future 80C51 family products to invoke new features.

In that case, the reset or inactive value of the new bit will be logic 0, and its active value will be logic 1. The value

read from a reserved bit is indeterminate.

8.7

Reduced EMI mode

When bit AO = 1 (bit 0 in the AUXR register), the ALE output is disabled.

BIT

543210

Symbol

−

−−−−

EXTRAM

BIT

SYMBOL

DESCRIPTION

7to2

−

Not implemented. Reserved for future use; note 1.

EXTRAM

External RAM access. Internal or external RAM access using MOVX @Ri/@DPTR.

If EXTRAM = 0, internal expanded RAM (0000h to 01FFh) access using

MOVX @Ri/@DPTR; if EXTRAM = 1, external data memory access.

0AO

ALE enable or disable. If AO = 0, ALE is emitted at a constant rate of 1/6fXTAL;ifAO = 1,

ALE is active only during a MOVX or MOVC instruction.

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