P89LPC922FN NXP Semiconductors, P89LPC922FN Datasheet - Page 9

• Manufacturer Part Number: P89LPC922FN
• Description: IC, MCU 8BIT 80C51 8K FLASH, DIP20
• Manufacturer: NXP Semiconductors

Specifications of P89LPC922FN

• Controller Family/series: (8051) 8052
• Core Size: 8bit
• No. Of I/o's: 18
• Program Memory Size: 8KB
• Ram Memory Size: 256Byte
• Cpu Speed: 18MHz
• Oscillator Type: External, Internal
• No. Of Timers: 4
• No. Of: RoHS Compliant

Philips Semiconductors
7. Special function registers
9397 750 14469
Product data
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 ‘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.
Rev. 08 — 15 December 2004
P89LPC920/921/922/9221
8-bit microcontrollers with two-clock 80C51 core
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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