PIC18LF4431T-I/PT Microchip Technology, PIC18LF4431T-I/PT Datasheet - Page 276
![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
23.3
The Two-Speed Start-up feature helps to minimize the
latency period from oscillator start-up to code execution
by allowing the microcontroller to use the INTRC oscil-
lator as a clock source until the primary clock source is
available. It is enabled by setting the IESO bit in
Configuration Register 1H (CONFIG1H<7>).
Two-Speed Start-up is available only if the primary
oscillator mode is LP, XT, HS or HSPLL (Crystal-Based
modes). Other sources do not require a OST start-up
delay; for these, Two-Speed Start-up is disabled.
When enabled, Resets and wake-ups from Sleep mode
cause the device to configure itself to run from the
internal oscillator block as the clock source, following
the time-out of the Power-up Timer after a Power-on
Reset is enabled. This allows almost immediate code
execution while the primary oscillator starts and the
OST is running. Once the OST times out, the device
automatically switches to PRI_RUN mode.
Because the OSCCON register is cleared on Reset
events, the INTOSC (or postscaler) clock source is not
initially available after a Reset event; the INTRC clock
is used directly at its base frequency. To use a higher
clock speed on wake-up, the INTOSC or postscaler
clock sources can be selected to provide a higher clock
speed by setting bits IRCF<2:0> immediately after
Reset. For wake-ups from Sleep, the INTOSC or post-
scaler clock sources can be selected by setting
IRCF<2:0> prior to entering Sleep mode.
FIGURE 23-2:
DS39616D-page 276
Note 1:
CPU Clock
Multiplexer
PLL Clock
Peripheral
Program
INTOSC
Two-Speed Start-up
Counter
Output
OSC1
Clock
Wake from Interrupt Event
T
OST
= 1024 T
PC
TIMING TRANSITION FOR TWO-SPEED START-UP (INTOSC TO HSPLL)
OSC
Q1
; T
T
PLL
OST
= 2 ms (approx). These intervals are not shown to scale.
(1)
Q2
PC + 2
OSTS bit Set
T
PLL
Q3
(1)
Q4
Q1
1
2
In all other power-managed modes, Two-Speed Start-
up is not used. The device will be clocked by the
currently selected clock source until the primary clock
source becomes available. The setting of the IESO
Configuration bit is ignored.
23.3.1
While using the INTRC oscillator in Two-Speed Start-
up, the device still obeys the normal command
sequences for entering power-managed modes,
including
Section 4.1.4 “Multiple Sleep
practice, this means that user code can change the
SCS<1:0> bit settings and issue SLEEP commands
before the OST times out. This would allow an applica-
tion to briefly wake-up, perform routine “housekeeping”
tasks and return to Sleep before the device starts to
operate from the primary oscillator.
User code can also check if the primary clock source is
currently providing the system clocking by checking the
status of the OSTS bit (OSCCON<3>). If the bit is set,
the primary oscillator is providing the system clock.
Otherwise, the internal oscillator block is providing the
clock during wake-up from Reset or Sleep mode.
Clock Transition
3
4
5
PC + 4
SPECIAL CONSIDERATIONS FOR
USING TWO-SPEED START-UP
serial
6
7
SLEEP
8
Q2
2010 Microchip Technology Inc.
Q3 Q4
instructions
Q1
Commands”). In
Q2
PC + 6
Q3 Q4
(refer
to
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