HT48R50A-1/HT48C50-1    I/O Type 8-bit MCU

Revision # 2.01   Modifications made on January 9, 2009

• 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 # 2.00   Modifications made on March 8, 2006

• The Pin Description table was modified.

Revision # 1.90   Modifications made on November 4, 2005

• The Pad Assignment section was deleted.

Revision # 1.80   Modifications made on May 30, 2005

• Technical Document section was added.

Revision # 1.70   Modifications made on September 21, 2004

• At the D.C. Characteristics table, the I_DD3 Parameter, as well as Typ. and Max. Conditions were modified.

Revision # 1.60   Modifications made on June 9, 2004

• 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 April 26, 2004

• The Product Title was modified from 8-Bit I/O Type MCU to I/O Type 8-Bit MCU.
• At the D.C. Characteristics table, the Min. value for the R_PH 3V was changed from 40kW to 20kW and the Max. value from 80kW to 100kW.

Revision # 1.40   Modifications made on February 19, 2004

• The Block Diagram was modified.
• At LVR section, the V_LVR values were changed from 3.3V to 3.0V for V_DD and from 2.4V to 2.2V for V_OPR.
• At the Options table, one of the options for System oscillator was changed from Int. RC+PC3/PC4 to Int. RC+PG1/PG2
• 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.

Revision # 1.31   Modifications made on December 16, 2003

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

Revision # 1.30   Modifications made on August 25, 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 # 1.20   Modifications made on May 12, 2003

• The TMR0, TMR1H and TMR1L entries on the table for the Reset register status were modified.

Revision # 1.10   Modifications made on January 17, 2003

• The system clock label on the block diagram was modified.
• At the  Oscillator section and other related sections, the WDT period was changed from 78µs to 65µs/5V.
• At the Watchdog Timer section and other related section, the nominal time-out period was changed from 16.6ms/5V to 17ms/5V.

Revision # 1.00   This was posted on January 2, 2003

• HT48R50A-1 and HT48C50-1 datasheets were combined. Revision number
   restarted from 1.00.