HT46R23/HT46C23    A/D Type 8-Bit MCU

Revision # 2.10   Modifications made on July 25, 2007

• A Technical Document section HA0075E was added.
• In the Reset Section the Reset Circuit Diagram was modified.
• The Application Circuits section was modified.

Revision # 2.00   Modifications made on November 24, 2005

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

Revision # 1.90   Modifications made on July 13, 2005

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

Revision # 1.80   Modifications made on July 5, 2005

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

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.
• 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 A/D Type MCU to A/D Type 8-Bit MCU.
• At the Block Diagram section, the TMR and TMRC portion of the diagram were modified.
• 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 # 1.50   Modifications made on February 3, 2004

• At the Features section, 8-bit accuracy was deleted and (6+2) (7+1) bit was changed to 8-bit.
• At the Block Diagram, the label SYS CLK/4 was modified to f_SYS/4.
• The Timer/Event Counter diagram was modified.
• At the Low Voltage Reset section, the specs (0.9V~3.3V) was changed to (0.9V~V_LVR). Then the diagram showing the relationship between V_DD and V_LVR, V_DD: 3.3V was changed to 3.0V and V_OPR: 3.0V was changed to 2.2V.

Revision # 1.41   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 September 3, 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 # 1.30   Modifications made on March 26, 2003

• At the Features section, D.C. Characteristics table and other related sections, the Operating voltage range of 4.5V~5.5V at f_SYS=8MHz was changed to 3.3V~5.5V.
• At the Absolute Maximum Ratings section, the Supply Voltage range of
  V_SS-0.3V to V_SS+5.5V was changed to V_SS-0.3V to V_SS+6.0V.
• The D.C. Characteristics table was modified.
• The A.C. Characteristics table was modified, with t_ADCS added and the values for t_WDTOSC modified.
• The 6+2 and 7+1 PWM mode diagrams were modified.
• The A/D conversion timing diagram was modified.
• Two programming examples on how to setup and implement A/D conversion were added.
• The two I²C flowcharts were modified.
• The Application Circuits diagram was modified.

Revision # 1.20   Modifications made on November 20, 2002

• At the Interrupt Priority table, Serial bus interrupt was added.

Revision # 1.10   Modifications made on September 24, 2002

• At the Input/Output ports section, brief function descriptions were added, particularly to PA3 and PD0 data registers.

Revision # 1.00   This was posted on August 26, 2002

• HT46R23 and HT46C23 datasheets were combined. Revision number
   restarted from 1.00.