PIC18LF4431T-I/PT Microchip Technology, PIC18LF4431T-I/PT Datasheet - Page 32
![IC MCU FLASH 8KX16 44TQFP](/photos/6/82/68251/c04-076_pt_sml.jpg)
PIC18LF4431T-I/PT
Manufacturer Part Number
PIC18LF4431T-I/PT
Description
IC MCU FLASH 8KX16 44TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheet
1.PIC18F2331-ISO.pdf
(392 pages)
Specifications of PIC18LF4431T-I/PT
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
Number Of I /o
36
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 9x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
768 B
Interface Type
EUSART, I2C, SPI, SSP
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
36
Number Of Timers
1 x 8
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
9 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18LF4431T-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
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PIC18F2331/2431/4331/4431
3.6
The PIC18F2331/2431/4331/4431 devices include an
internal oscillator block, which generates two different
clock signals; either can be used as the system’s clock
source. This can eliminate the need for external
oscillator circuits on the OSC1 and/or OSC2 pins.
The main output (INTOSC) is an 8 MHz clock source,
which can be used to directly drive the system clock. It
also drives a postscaler, which can provide a range of
clock frequencies from 125 kHz to 4 MHz. The
INTOSC output is enabled when a system clock
frequency from 125 kHz to 8 MHz is selected.
The other clock source is the internal RC oscillator
(INTRC), which provides a 31 kHz output. The INTRC
oscillator is enabled by selecting the internal oscillator
block as the system clock source, or when any of the
following are enabled:
• Power-up Timer
• Fail-Safe Clock Monitor
• Watchdog Timer
• Two-Speed Start-up
These features are discussed in greater detail in
Section 23.0 “Special Features of the
The clock source frequency (INTOSC direct, INTRC
direct or INTOSC postscaler) is selected by configuring
the IRCF bits of the OSCCON register
3.6.1
Using the internal oscillator as the clock source can
eliminate the need for up to two external oscillator pins,
which can then be used for digital I/O. Two distinct
configurations are available:
• In INTIO1 mode, the OSC2 pin outputs F
• In INTIO2 mode, OSC1 functions as RA7 and
DS39616D-page 32
while OSC1 functions as RA7 for digital input and
output.
OSC2 functions as RA6, both for digital input and
output.
Internal Oscillator Block
INTIO MODES
(Register
CPU”.
OSC
/4,
3-2).
frequency by varying amounts and may not be mono-
3.6.2
The internal oscillator block is calibrated at the factory
to produce an INTOSC output frequency of 8.0 MHz.
This changes the frequency of the INTRC source from
its nominal 31.25 kHz. Peripherals and features that
depend on the INTRC source will be affected by this
shift in frequency.
3.6.3
The internal oscillator’s output has been calibrated at the
factory, but can be adjusted in the user’s application.
This is done by writing to the OSCTUNE register
(Register
tonic. The next closest frequency may be multiple steps
apart.
When the OSCTUNE register is modified, the INTOSC
and INTRC frequencies will begin shifting to the new
frequency. Code execution continues during this shift.
There is no indication that the shift has occurred. Oper-
ation of features that depend on the INTRC clock
source frequency, such as the WDT, Fail-Safe Clock
Monitor and peripherals, will also be affected by the
change in frequency.
3.6.4
The factory calibrates the internal oscillator block out-
put (INTOSC) for 8 MHz. This frequency, however, may
drift as the V
affect the controller operation in a variety of ways.
The INTOSC frequency can be adjusted by modifying
the value in the OSCTUNE register. This has no effect
on the INTRC clock source frequency.
Tuning the INTOSC source requires knowing when to
make an adjustment, in which direction it should be
made, and in some cases, how large a change is
needed. Three compensation techniques are discussed
in
EUSART”,
Timers”
CCP Module in Capture
may be used.
Section 3.6.4.1
and
3-1). Each increment may adjust the FRC
INTRC OUTPUT FREQUENCY
OSCTUNE REGISTER
INTOSC FREQUENCY DRIFT
Section 3.6.4.2 “Compensating with the
Section 3.6.4.3 “Compensating with the
DD
or temperature changes, which can
“Compensating
2010 Microchip Technology Inc.
Mode”, but other techniques
with
the
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