P89LPC904 데이터 시트보기 (PDF) - Philips Electronics

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P89LPC904

8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter

Philips Electronics 

Philips Semiconductors

P89LPC904

8-bit microcontrollers with two-clock accelerated 80C51 core

7. Special function registers

Remark: Special Function Registers (SFRs) accesses are restricted in the following

ways:

• User must not attempt to access any SFR locations not defined.

• Accesses to any defined SFR locations must be strictly for the functions for the

SFRs.

• SFR bits labeled ‘-’, ‘0’ or can only be written and read as follows:

– ‘-’ Unless otherwise specified, must be written with ‘0’, but can return any value

when read (even if it was written with ‘0’). It is a reserved bit and may be used in

future derivatives.

– ‘0’ must be written with ‘0’, and will return a ‘0’ when read.

– ‘1’ must be written with ‘1’, and will return a ‘1’ when read.

9397 750 13521

Preliminary data

Rev. 02 — 25 June 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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