PIC16LF1904-E/P Microchip Technology, PIC16LF1904-E/P Datasheet - Page 192

• Manufacturer Part Number: PIC16LF1904-E/P
• Description: 7KB Flash, 256B RAM, LCD, 14x10b ADC, EUSART, NanoWatt XLP 40 PDIP .600in TUBE
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16LF1904-E/P

• 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: 40-DIP (0.600", 15.24mm)
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16LF1904/6/7
19.2
The LCD module has 3 possible clock sources:
• F
• T1OSC
• LFINTOSC
The first clock source is the system clock divided by
256 (F
about 1 kHz output when the system clock is 8 MHz.
The divider is not programmable. Instead, the LCD
prescaler bits LP<3:0> of the LCDPS register are used
to set the LCD frame clock rate.
The second clock source is the T1OSC. This also gives
about 1 kHz when a 32.768 kHz crystal is used with the
Timer1 oscillator. To use the Timer1 oscillator as a
clock source, the T1OSCEN bit of the T1CON register
should be set.
The third clock source is the 31 kHz LFINTOSC, which
provides approximately 1 kHz output.
The second and third clock sources may be used to
continue running the LCD while the processor is in
Sleep.
FIGURE 19-2:
DS41569A-page 192
OSC
Nominal = 31 kHz
T1OSC 32 kHz
F
OSC
Crystal Osc.
OSC
/256
LFINTOSC
LCD Clock Source Selection
/256). This divider ratio is chosen to provide
÷256
LCD CLOCK GENERATION
CS<1:0>
÷2
÷4
LMUX<1:0>
Preliminary
Static
1/2
1/3,
1/4
4-bit Prog
Using bits CS<1:0> of the LCDCON register can select
any of these clock sources.
19.2.1
A 4-bit counter is available as a prescaler for the LCD
clock. The prescaler is not directly readable or writable;
its value is set by the LP<3:0> bits of the LCDPS register,
which determine the prescaler assignment and prescale
ratio.
The prescale values are selectable from 1:1 through
1:16.
Prescaler
LP<3:0>
Power Control
LCD PRESCALER
To Ladder
Counter
÷ 32
 2011 Microchip Technology Inc.
Segment
Clock
Ring Counter
÷1, 2, 3, 4