MTU419B 查看數據表（PDF） - Myson Century Inc

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MTU419B

4-bit Microcontroller with LCD Driver

Myson Century Inc 

MYSON

TECHNOLOGY

MTU419B

(Preliminary)

D1

ELP

ELC

R1

R2

EL-plane

LIT

ELP

ELC

4.5 Key_board Scanning Function

SEG1~12 shares the key_board scanning output, the output of the key_board scanning is a P open-drain to

VDDO (positive power supply) and all other SEGs and COMs are in Hi-z state during this period. This will min-

imize the effect of the LCD output.

The segment 1-12 also could be used as keyscan output and LCD still could be displayed with only slightly

affected.

SPK 00b5 b4 b3 b2 b1 b0.

b5: 1 will disable key-scan output.

b4: 1 will set all keyscan output as high, if b5=0.

b3~b0: will set the corresponding segment output as 1, if b5=0 and b4=0.

During power on, LCD off, STOP condition. All the common & segment output will be the chips supply power.

4.6 EL-light

Set ELC and ELP clock and duty cycle using ELC X instruction, then turn on and off ELC and ELP output by

SF X and RF X instruction. With external transistor, diode, inductor and resistor, we can pump the EL panel to

AC 100~250V.

When the EL-light is turned on, the ELC will turn on before ELP, but when the EL-light is off, the ELP and ELC

will turn off after the next falling edge of ELC in order to make sure no voltage is left on the EL plane.

4.7 TIMER

The 6-bit programmable timer can select PH3/PH9/PH15/FREQ (Timer 2 can also select PH5/ PH7/ PH11/

PH13 by TM2X instruction) as clock source. When it underflows, the halt release signals are generated.

4.8 Predivider

The predivider is a 15-sage counter that uses PH0 as clock source. The output of T-FF is changed when the

input signal is changed from H to L. PH11~15 are reset to L when PLC 100H instruction is executed or power

on reset or external reset is used. When PH14 is changed from H to L, the halt release signal is generated.

4.9 Alarm / Frequency / Melody

There is an 8-bit programmable counter and an 8-bit envelope control for alarm, frequency or melody output

from BZ/BZB.

The frequency counter can use software to select 1/2duty, 1/3duty,1/4duty drive modes.

6/18

MTU419B Revision 3.0 28/Oct/1999

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