Revision # 2.00   Modifications made on July 10, 2007

• In the oscillator configuration section the value of the external oscillator resistor range was changed.

Revision # 1.90   Modifications made on April 26, 2007

• The IDD2 value in the D.C. Characteristics table was modified.
  　
• The TMR entry in the Reset Table was modified.

Revision # 1.80   Modifications made on December 26, 2005

• A Technical Document section was added.
• At the A.C. Characteristics table, the f_SYS2 entries was modified.
• In the Application Circuits section, the entries for OSC1, RESETB were modified.

Revision # 1.70   Modifications made on December 15, 2003

• At the D.C. Characteristics table, the Typ. and Max. values for LED Sink Current were modified.
• At the Pin Description table, the descriptions for PE2, PE3 and PE4 were modified, with I_OL=18mA at V_OL=3.4V.

Revision # 1.60   Modifications made on November 27, 2003

• At the D.C. Characteristics table, I_OH1 entries were added and modifications were made on the  Parameter description, as well as the Min. and Typ. values of the I_OL and I_OH2.

Revision # 1.50   Modifications made on August 15, 2003

• At the Features section, Pin Assignment section and other related sections, 40-pin DIP package was deleted.
• The PD flag label was changed to PDF flag.
• The ROM Code Option table was modified.
• The Instruction Definition section was modified, with the first two columns deleted.

Revision # 1.40   Modifications made on March 25, 2003

• At the D.C. Characteristics table, the entries for CMOS Input Low and Input High Voltage for I/O Ports were deleted.

Revision # 1.30   Modifications made on March 6, 2003

• The following were modified at the D.C. Characteristics table:
  • The R_PH values for the 5V entries were changed and 3V entries added for R_PH, R_PH1 and R_PH2.
  • The Max. value for the Frequency variation was changed from ±10 to ±20.

Revision # 1.20   Modifications made on February 13, 2003

• At the Features, D.C. Characteristics sections and other related sections, the previous Operating voltage range of 2.4V~5.5V was changed to 2.2V~5.5V.
• 2.4 LVR was added to the Features section and all related sections.
• At the Absolute Maximum Ratings section the -0.3V to 5.5V Supply Voltage range was changed to V_SS - 0.3V to V_SS + 6.0V.
• V_LVR were added to the D.C. Characteristics table and all related sections. The entries for t_POR were modified in this same table.
• Low voltage reset - LVR section was added.
• LVR enable/disable Option was added to the Mask Option table.
• Package Information section was added.
• Product Tape and Reel Specifications section was added.

Revision # 1.10   Modifications made on November 14, 2001

• Product Tape and Reel Specifications section was added.
• The Operating Voltage V_DD was changed to 2.4V~5.5V. Previously it was 2.8V~5.5V.
• 20/28-pin SOP package was added to the Pin Assignment section.
• Description for an external interrupt pin (shared with PC2) was added at the Features section, Block Diagram, Pin Description table, and all the related sections.
• The D.C. Characteristics table was updated.
• Description for a special vector location 004H was added at the Program Memory section.
• The Interrupt section of the Functional description was updated and the INTC register table was modified as well.

Revision # 1.00   Modifications made on December 11, 2000

• Preliminary texts were deleted from the front page heading and the subsequent pages.

Revision # 0.10   Modifications made on August 15, 2000

• The operating voltage which was originally within the range 2.4V ~ 5.5V was changed to 2.8V ~ 5.5V.