HT67F60 datasheet(213/242 Pages) HOLTEK

213 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPROM

Rev. 1.50

212

March 06 , 2012

Rev. 1.50

213

March 06 , 2012

For the C type 1/2 bias selection, three voltage levels VSS, VA and VB are utilised. The voltage VA

is generated internally and has a value of VLCD. VB will have a value equal to VAx0.5. For the C

type 1/2 bias configuration VC is not used.

For the C type 1/3 bias selection, four voltage levels VSS, VA, VB and VC are utilised. The voltage

VA is generated internally and has a value of VLCDx1.5. VB will have a value equal to VAx 2/3 and

VC will have a value equal to VA x 1/3. The connection to the VMAX pin depends upon the bias

and the voltage that is applied to VLCD, the details are shown in the table. It is extremely important

to ensure that these charge pump generated internal voltages do not exceed the maximum VDD

voltage of 5.5V.

Biasing Type

VMAX Connection

1/3

Bias

VDD>VLCDx1.5

Connect VMAX to VDD

Otherwise

Connect VMAX to V1

1/2

Bias

VDD>VLCD

Connect VMAX to VDD

Otherwise

Connect VMAX to VLCD

C Type Biasing VMAX Connection

LCD Waveform Timing Diagrams

The accompanying timing diagrams depict the display driver signals generated by the

microcontroller for various values of duty and bias. The huge range of various permutations only

permit a few types to be displayed here.

CO M0 s egm ent s ON

CO M1 s egm ent s ON

Al l s egm ent s ON

VSS

CO M0

CO M1

Al l s egm ent s OF F

VSS

No rm a l O pe ra ti on M od e

CO M0 , CO M1

Al l se gm ent out pu ts

VSS

1 Fr am e

Du ri ng R eset o r in HAL T M ode

LCD Driver Output – Type A - 1/2 Duty, 1/2 Bias

Note: For 1/2 Bias, VA=VLCD, VB=VLCDx1/2 for both R and C type.

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