HT46R24/HT46C24    A/D Type 8-Bit MCU

Revision # 2.00   Modifications made on March 2, 2006

  • The last paragraph in the "Data Memory - RAM" section has been modified.

Revision # 1.90   Modifications made on November 24, 2005

  • The Program Memory diagram was modified.
  • The Watchdog Timer diagram was modified. 
  • In the Options section, the WDT time-out period was modified.

Revision # 1.80   Modifications made on July 13, 2005

  • In the Oscillator Configuration section, the System Oscillator diagram was modified.

Revision # 1.70   Modifications made on July 5, 2005

  • Technical Document section was added.
  • Pad Assignment section was deleted.
  • The INTC0 (0BH) Register table, the Bit 7 function was modified.
  • The TMR0C & TMR1C Register table, the TE function were modified.
  • The A/D Converter section was modified.

Revision # 1.60   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 # 1.50   Modifications made on May 3, 2004

  • The Product Title was modified from 8-Bit A/D Type MCU to A/D 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 & OSC2 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.

Revision # 1.40   Modifications made on February 23, 2004

  • The Block Diagram was modified.
  • At the Timer/Event Counter section, the labels of the TMR0C and TMR1C tables, and the Timer/Event Counter 0 and Timer/Event Counter 1 diagrams were modified. The modifications were as follows: from PSC0~PSC2 to T0PSC0~T0PSC2, from TE, TON, TM0, TM1 to T0E, T0ON,T0M0, T0M1 respectively, etc.
  • At the Options table, the options for PD2 and PD3 PWM selection were  changed from level output or PWM0 to level output or PWM2 output for PD2, from level output or PWM1 to level output or PWM3 output for PD3.

Revision # 1.30   Modifications made on February 3, 2004

  • At the Features section, 9-bit accuracy was deleted and (6+2) (7+1) bit was changed to 8-bit.
  • The Timer/Event Counter 0 and Timer/Event Counter 1 diagrams were modified.
  • At the Timer/Event Counter section and at the Mask Option table, on the topic about PFD selection, a sentence was added discussing if PA3 is set as PFD output...
  • At the diagram showing the relationship between VDD and VLVR, 3.5V VDD was changed to 3.0V.

Revision # 1.20   Modifications made on January 15, 2004

  • At the Data Memory section, a paragraph that discussed about accessing the Memory Banks has been added.

Revision # 1.11   Modifications made on December 16, 2003

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

Revision # 1.10   Modifications made on August 28, 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 Instruction Definition section was modified, with the first two columns deleted.

Revision # 1.00   This was posted on June 11, 2003

 
 

Product Description