resolution but with a longer read-out rate (for example: 10 seconds per read-out), you can switch the measure

mode in order to set FIN (CX) as interval control (it will enable the counter from first FIN rising edge to the next

rising edge, then will generate an interrupt) and use FREQ (internal frequency generator output) as clock

input, hence you can count the interval of CX.

To measure the resistor value of the temperature and humidity sensor, we must first measure the frequency

of Rref, then the frequency of sensor.

Fref= K/Rref CX and

Fsensor= K/Rsensor CX, hence

Rsensor= Rref * Freq/Fsensor.

Where K is a coefficient for RC-oscillation and will be a constant in a short time period.

Keyboard scanning function

SEG11~26 shares the keyboard scanning output, the output of the keyboard 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

minimize the effect of the LCD output.

The segment 11-26 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.

EL-light

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

by SF X and RF X instruction. With external transistor, diode, inductor and resistor, we can pump the Elpanel

to AC 100~250V.

LIT

ELP

ELC

R2

ELC

ELP

R1

Q1

Q2

EL-plane

D1

L1

While the light is turned on, the ELC will turn on before the ELP, but when the light is turned off, the ELP and

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

Preliminary

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