PIC16F946-ESLASHMLQTP datasheet(169/330 Pages) MICROCHIP

169 / 330 page

DS41250F-page 167

PIC16F913/914/916/917/946

10.11 Configuring the LCD Module

The following is the sequence of steps to configure the

LCD module.

Select the frame clock prescale using bits

LP<3:0> of the LCDPS register.

Configure the appropriate pins to function as

segment drivers using the LCDSEn registers.

Configure the LCD module for the following

using the LCDCON register:

- Multiplex and Bias mode, bits LMUX<1:0>

- Timing source, bits CS<1:0>

- Sleep mode, bit SLPEN

Write initial values to pixel data registers,

LCDDATA0 through LCDDATA11 (LCDDATA23

on PIC16F946).

Clear LCD Interrupt Flag, LCDIF bit of the PIR2

setting bit LCDIE of the PIE2 register.

Enable bias voltage pins (VLCD<3:1>) by

setting bit VLCDEN of the LCDCON register.

Enable the LCD module by setting bit LCDEN of

the LCDCON register.

10.12 Disabling the LCD Module

To disable the LCD module, write all ‘0’s to the

LCDCON register.

10.13 LCD Current Consumption

When using the LCD module the current consumption

consists of the following three factors:

The oscillator selected

The LCD bias source

The current required to charge the LCD

segments

The current consumption of just the LCD module can

be considered negligible compared to these other

factors.

The oscillator selected:

For LCD operation during Sleep either the T1oc or the

LFINTOSC sources need to be used as the main

system oscillator may be disabled during Sleep. During

Sleep the LFINTOSC current consumption is given by

electrical parameter D021, where the LFINTOSC use

the same internal oscillator circuitry as the Watchdog

Timer.

The LCD bias source:

The LCD bias source, typically an external resistor

ladder which will have its own current draw.

The current required to charge the LCD segments:

The LCD segments which can be modeled as capaci-

tors which must be both charged and discharged every

frame. The size of the LCD segment and its technology

determines the segment’s capacitance.

PIC16F946-E/MLQTP Datasheet(PDF) 169 Page - Microchip Technology

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