PIC16F1938-I/ML Microchip Technology, PIC16F1938-I/ML Datasheet - Page 250

• Manufacturer Part Number: PIC16F1938-I/ML
• Description: IC MCU 8BIT FLASH 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1938-I/ML

• Core Size: 8-Bit
• Program Memory Size: 28KB (16K x 14)
• Oscillator Type: Internal
• Core Processor: PIC
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Controller Family/series: PIC16F
• No. Of I/o's: 25
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 1024Byte
• Cpu Speed: 32MHz
• Package: 28QFN EP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 32 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 25
• Interface Type: I2C/SPI/USART
• On-chip Adc: 11-chx10-bit
• Number Of Timers: 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC16F193X/LF193X
21.2
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 21-2:
DS41364C-page 250
OSC
OSC
/256
F
Nominal = 31 kHz
LCD Clock Source Selection
OSC
T1OSC 32 kHz
/256). This divider ratio is chosen to provide
Crystal Osc.
LFINTOSC
÷256
LCD CLOCK GENERATION
(LCDCON<3:2>)
CS<1:0>
÷2
÷4
(LCDCON<1:0>)
Preliminary
LMUX<1:0>
Static
1/3,
1/2
1/4
Using bits CS<1:0> of the LCDCON register can select
any of these clock sources.
21.2.1
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.
(LCDPS<3:0>)
4-bit Prog
Prescaler
LP<3:0>
LCD PRESCALER
To Reference
Ladder Control
÷32
© 2009 Microchip Technology Inc.
5
(LCDCON<1:0>)
Ring Counter
LMUX<1:0>
÷1, 2, 3, 4