P89LPC9321 NXP Semiconductors, P89LPC9321 Datasheet - Page 11

• Manufacturer Part Number: P89LPC9321
• Description: The P89LPC9321 is a single-chip microcontroller, available in low cost packages, basedon a high performance processor architecture that executes instructions in two to fourclocks, six times the rate of standard 80C51 devices
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
P89LPC9321
Product data sheet
7.1 Special function registers
Remark: Please refer to the P89LPC9321 User manual for a more detailed functional
description.
Remark: SFR accesses are restricted in the following ways:
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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
– ‘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.
when read (even if it was written with ‘0’). It is a reserved bit and may be used in
future derivatives.
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 16 November 2010
8-bit microcontroller with accelerated two-clock 80C51 core
P89LPC9321
© NXP B.V. 2010. All rights reserved.
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