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P89LPC9331FDH データシート(PDF) 12 Page - NXP Semiconductors |
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P89LPC9331FDH データシート(HTML) 12 Page - NXP Semiconductors |
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12 / 93 page  P89LPC9331_9341_9351_9361_3 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 — 2 June 2009 12 of 93 NXP Semiconductors P89LPC9331/9341/9351/9361 8-bit microcontroller with accelerated two-clock 80C51 core 7. Functional description Remark: Please refer to the P89LPC9331/9341/9351/9361 User manual for a more detailed functional description. 7.1 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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