HT46R0664 datasheet(72/92 Pages) HOLTEK

72 / 92 page

Rev. 1.00

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HT46R0664

Enhanced A/D+LCD Type 8-Bit OTP MCU

capability of waking up the microcontroller when it is in SLEEP or IDLE Mode, the wake up being

generated when the interrupt request flag changes from low to high. If it is required to prevent a

certain interrupt from waking up the microcontroller then its respective request flag should be first

set high before entering the SLEEP or IDLE Mode.

As only the Program Counter is pushed onto the stack, then when the interrupt is serviced, if the

contents of the accumulator, status register or other registers are altered by the interrupt service

program, their contents should be saved in advance.

To return from an interrupt subroutine, either a RET or RETI instruction may be executed. The RETI

instruction in addition to executing a return to the main program also automatically sets the EMI

bit high to allow further interrupts. The RET instruction however only executes a return to the main

program leaving the EMI bit in its present zero state and therefore disabling the execution of further

interrupts.

LCD Function

For large volume applications, which incorporate an LCD in their design, the use of a custom

display rather than a more expensive character based display reduces costs significantly. However,

the corresponding COM and SEG signals required, which vary in both amplitude and time, to drive

such a custom display require many special considerations for proper LCD operation to occur. This

device contains an LCD Driver function, which with their internal LCD signal generating circuitry

and various options, will automatically generate these time and amplitude varying signals to provide

a means of direct driving and easy interfacing to a range of custom LCDs.

Duty

Driver No.

Bias

Bias Type

Wave Type

1/4

�3×4

1/3 or 1/4

� or B

1/8

19×8

LCD Selections

R ty pe 1 /3 B ia s

VD D

V A

V B

LC D

Po we r Su pp ly

V C

(= VD D ´ 2/ 3)

(= VD D ´ 1/ 3)

(= V DD)

LC D On /O ff

R ty pe 1 /4 B ia s

VD D

V A

V B

LC D

Po we r Su pp ly

V D

(= VD D ´ 3/ 4)

(= VD D ´ 1/ 4)

(= V DD)

LC D On /O ff

V C

(= VD D ´ 2/ 4)

R Type Bias Voltage Levels

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