Nxp-semiconductors P89LPC9321 UM10310 Manual do Utilizador descarregar pdf (Página 10)

User manual Rev. 2 — 1 November 2010 10 of 139

NXP Semiconductors

UM10310

P89LPC9321 User manual

1.5 Special function registers

Remark: SFR 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 ‘1’ 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.

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Nxp-semiconductors P89LPC9321 UM10310 Manual do Utilizador Página 10