HT49R50A-1/HT49C50-1/HT49C50L Revision # 2.40 Modifications made on July 30, 2012 In the Oscillator Configuration section, the Crystal Specifications table was added. Revision # 2.30 LCD Type 8-Bit MCU Modifications made on May 3, 2011 In the Features section and other related sections, the 100-pin QFP package was changed to 100-pin LQFP. Revision # 2.20 Modifications made on December 16, 2009 In the Features and other related sections, the 64LQFP new package type was added. In the Absolute Maximum Ratings section, the IOL, IOH Total and Total Power Dissipation were added. The Instruction Set section was modified. The Instruction Definition section was modified. The Package Information section was modified. The Product Tape and Reel Specifications section was modified. Revision # 2.10 Modifications made on April 24, 2006 In the oscillator configuration and application circuit section the value of the external oscillator resistor range was changed. Revision # 2.00 Modifications made on November 29, 2005 The D.C. Characteristics table was modified. At the A.C. Characteristics table, the tLVR entries was added. The registers status in the table, the PB entries was added. The TMR0C & TMR1C Register table, the T0E/T1E function were modified. Revision # 1.90 Modifications made on June 10, 2005 Technical Document section was added. Pad Assignment section was deleted. Revision # 1.80 Modifications made on September 21, 2004 At the D.C. Characteristics table, the IDD3 Parameter, as well as Typ. and Max. Conditions were modified. At the table below the Application Circuits section, the entries of the column for Crystal or Resonator were modified. A brief functional description for R1 was added at the bottom portion of the table. Revision # 1.70 Modifications made on May 3, 2004 The Product Title was modified from 8-Bit LCD Type MCU to LCD Type 8-Bit MCU. At the Block Diagram section, the TMR0, TMR0C, TMR1 and TMR1C portion of the diagram were modified. At the Pin Description table, the OSC1 to OSC4 entries for the I/O column were modified. At the D.C. Characteristics table, the Min. value for the RPH 3V was changed from 40k to 20k and the Max. value from 80k to 100k. At the A.C. Characteristics table, the 1.2V~2.2V Conditions for fSYS1, fSYS2 and fTIMER were specified for HT49C50L. At the Timer/Event Counter section, some of the text contents were modified, including the Timer/Event Counter 0 and Timer/Event Counter 1 diagrams. The Labels for the TMR0C and TMR1C Register tables were also modified. Revision # 1.60 Modifications made on December 16, 2003 At the Instruction Set Summary and Instruction Definition sections, the missing TABRDL [m] instructions were added back. Revision # 1.50 Modifications made on August 27, 2003 The Application Circuits diagram was modified and the RC system oscillator range was changed from 24k<ROSC<1M to 30k<ROSC<750k. Revision # 1.40 Modifications made on August 18, 2003 The PD flag label was changed to PDF flag. The Application Circuits were modified. o The recommended RESET circuitry was modified. For reasons of stability and noise immunity, the 2-resistor/2-capacitor or 2-resistor/1-capacitor recommended circuits are an improvement over the 1-resistor/1-capacitor circuit. The choice of which circuit is used depends upon the user application. For example, for battery powered applications the single resistor and single capacitor circuit may be adequate whereas for applications such as home appliances, industrial control applications or for circuits which are close to electrical noise sources, the 2-resistor/2-capacitor circuit may be the better choice. o The Crystal OSC application circuitry was also modified The recommended additional resistor has been added to ensure that the oscillator will cease to function when the supply voltage falls below 2.2V to prevent microcontroller malfunctions. This is because of instabilities in the oscillator at supply voltages of less than 2.2V. o The RC system oscillator range was changed from 24k<ROSC<1M to 30k<ROSC<750k. The Instruction Definition section was modified, with the first two columns deleted. Revision # 1.30 Modifications made on July 24, 2003 The General Description was modified. The Pad Description table was modified. The D.C. Characteristics table was modified, particularly IDD4 and ISTB2. The register status table was modified, particularly TMR0, TMR1 and PC. The Reset circuit was modified. The RES pin in the Application Circuits diagram for HT49R50A-1/HT49C50-1 were modified. Revision # 1.20 Modifications made on January 13, 2003 At the Features section and other related sections, the Operating voltage was modified. Pad Assignment for HT49R50A-1 was added. At the Absolute Maximum Ratings section, the values for the Supply Voltage range were modified. The D.C. Characteristics table was modified. The A.C. Characteristics table was modified. The LCD Driver Output section was modified. Revision # 1.10 Modifications made on October 21, 2002 HT49C50L was added to the HT49R50A-1/HT49C50-1 series.