HT49R70A-1/HT49C70-1/HT49C70L    LCD Type 8-Bit MCU

Revision # 2.10   Modifications made on June 20, 2008

  • The Absolute Maximum Ratings section was modified.
  • The D.C. Characteristics section was modified.
  • The A.C. Characteristics section was modified.
  • The Oscillator section was modified.
  • The Application Circuits section was modified.
  • The Instruction Set section was modified.
  • The Instruction Definition section was modified.

Revision # 2.00   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 # 1.90   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 TE function were modified.

Revision # 1.80   Modifications made on June 13, 2005

  • Technical Document section was added.
  • Pad Assignment section was deleted.

Revision # 1.70   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 # 1.60   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 40kW to 20kW and the Max. value from 80kW to 100kW.
  • At the A.C. Characteristics table, the 1.2V~2.2V Conditions for fSYS1, fSYS2 and fTIMER were specified for HT49C70L.
  • 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 # 1.50   Modifications made on December 16, 2003

  • At the Instruction Set Summary and Instruction Definition sections, the missing TABRDL [m] instructions were added back.

Revision # 1.40   Modifications made on August 27, 2003

  • The PD flag label was changed to PDF flag.
  • The Application Circuits were modified.
    • 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.
    • 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.
    • The RC system oscillator range was changed from 24kW<ROSC<1MW to
             30kW<ROSC<750kW.
  • The Instruction Definition section was modified, with the first two columns deleted.

Revision # 1.30   Modifications made on July 24, 2003

  • At the Features section, 41x2 segment LCD driver was added.
  • 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, TMR1H and TMR1L.
  • The Reset circuit was modified.
  • The RES pin in the Application Circuits diagram for HT49R70A-1/HT49C70-1 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 HT49R70A-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   This was re-posted on October 17, 2002

  • HT49C70L was added to the HT49R70A-1/HT49C70-1 series.

 
 

Product Description