PIC16LF1904-E/PT Microchip Technology, PIC16LF1904-E/PT Datasheet - Page 217

• Manufacturer Part Number: PIC16LF1904-E/PT
• Description: 7KB Flash, 256B RAM, LCD, 14x10b ADC, EUSART, NanoWatt XLP 44 TQFP 10x10x1mm TRA
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16LF1904-E/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: LIN, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

19.12 Configuring the LCD Module
The following is the sequence of steps to configure the
LCD module.
1.
2.
3.
4.
5.
6.
7.
19.13 Disabling the LCD Module
To disable the LCD module, write all ‘0’s to the
LCDCON register.
 2011 Microchip Technology Inc.
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:
Write initial values to pixel data registers,
LCDDATA0 through LCDDATA21.
Clear LCD Interrupt Flag, LCDIF bit of the PIR2
register and if desired, enable the interrupt by
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.
- Timing source, bits CS<1:0>
- Sleep mode, bit SLPEN
- Multiplex and Bias mode, bits LMUX<1:0>
Preliminary
19.14 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.
19.14.1
The current consumed by the clock source selected
must be considered when using the LCD module. See
Section 22.0 “Electrical Specifications”
current consumption information.
19.14.2
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.
19.14.3
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.
PIC16LF1904/6/7
OSCILLATOR SELECTION
LCD BIAS SOURCE
CAPACITANCE OF THE LCD
SEGMENTS
DS41569A-page 217
for oscillator