Nxp-semiconductors P89LPC9321 UM10310 Instrukcja Użytkownika Strona 10

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UM10310 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
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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