PIC16F1946 datasheet(367/448 Pages) MICROCHIP

367 / 448 page

 2010-2011 Microchip Technology Inc.

Preliminary

DS41414C-page 367

PIC16(L)F1946/1947

27.13 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 LCDDATA23.

Clear LCD Interrupt Flag, LCDIF bit of the PIR2

setting bit LCDIE of the PIE2 register.

Configure bias voltages by setting the LCDRL,

LCDREF and the associated ANSELx

registers as needed.

Enable the LCD module by setting bit LCDEN of

the LCDCON register.

27.14 Disabling the LCD Module

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

LCDCON register.

27.15 LCD Current Consumption

When using the LCD module the current consumption

consists of the following three factors:

• Oscillator Selection

• LCD Bias Source

• Capacitance of the LCD segments

The current consumption of just the LCD module can

be considered negligible compared to these other

factors.

27.15.1

OSCILLATOR SELECTION

The current consumed by the clock source selected

must be considered when using the LCD module. See

Section 30.0 “Electrical Specifications”

for oscillator

current consumption information.

27.15.2

LCD BIAS SOURCE

The LCD bias source, internal or external, can contrib-

ute significantly to the current consumption. Use the

highest possible resistor values while maintaining

contrast to minimize current.

27.15.3

CAPACITANCE OF 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.

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