PIC16LF819T-E/SO Microchip Technology, PIC16LF819T-E/SO Datasheet - Page 47
![IC PIC MCU FLASH 2KX14 18SOIC](/photos/6/76/67656/150-18-soic_sml.jpg)
PIC16LF819T-E/SO
Manufacturer Part Number
PIC16LF819T-E/SO
Description
IC PIC MCU FLASH 2KX14 18SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Specifications of PIC16LF819T-E/SO
Core Processor
PIC
Core Size
8-Bit
Speed
10MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
3.5KB (2K x 14)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 5x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
18-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
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4.5
PIC18F2450/4450 devices incorporate three separate
on-chip timers that help regulate the Power-on Reset
process. Their main function is to ensure that the
device clock is stable before code is executed. These
timers are:
• Power-up Timer (PWRT)
• Oscillator Start-up Timer (OST)
• PLL Lock Time-out
4.5.1
The Power-up Timer (PWRT) of the PIC18F2450/4450
devices is an 11-bit counter which uses the INTRC
source as the clock input. This yields an approximate
time interval of 2048 x 32 μs = 65.6 ms. While the
PWRT is counting, the device is held in Reset.
The power-up time delay depends on the INTRC clock
and will vary from chip to chip due to temperature and
process variation. See DC parameter 33 (Table 21-10)
for details.
The PWRT is enabled by clearing the PWRTEN
Configuration bit.
4.5.2
The Oscillator Start-up Timer (OST) provides a
1024 oscillator cycle (from OSC1 input) delay after the
PWRT delay is over (parameter 33, Table 21-10). This
ensures that the crystal oscillator or resonator has
started and stabilized.
The OST time-out is invoked only for XT, HS and
HSPLL modes and only on Power-on Reset or on exit
from most power-managed modes.
TABLE 4-2:
© 2008 Microchip Technology Inc.
HS, XT
HSPLL, XTPLL
EC, ECIO
ECPLL, ECPIO
INTIO, INTCKO
INTHS, INTXT
Note 1:
Configuration
2:
Oscillator
Device Reset Timers
66 ms (65.5 ms) is the nominal Power-up Timer (PWRT) delay.
2 ms is the nominal time required for the PLL to lock.
POWER-UP TIMER (PWRT)
OSCILLATOR START-UP
TIMER (OST)
TIME-OUT IN VARIOUS SITUATIONS
66 ms
66 ms
66 ms
(1)
66 ms
PWRTEN = 0
+ 1024 T
(1)
(1)
66 ms
66 ms
(1)
+ 1024 T
+ 1024 T
+ 2 ms
Power-up
OSC
(1)
(1)
+ 2 ms
OSC
(2)
OSC
(2)
(2)
and Brown-out
4.5.3
With the PLL enabled in its PLL mode, the time-out
sequence following a Power-on Reset is slightly differ-
ent from other oscillator modes. A separate timer is
used to provide a fixed time-out that is sufficient for the
PLL to lock to the main oscillator frequency. This PLL
lock time-out (T
oscillator start-up time-out.
4.5.4
On power-up, the time-out sequence is as follows:
1.
2.
The total time-out will vary based on oscillator configu-
ration and the status of the PWRT. Figure 4-3,
Figure 4-4, Figure 4-5, Figure 4-6 and Figure 4-7 all
depict time-out sequences on power-up, with the
Power-up Timer enabled and the device operating in
HS Oscillator mode. Figure 4-3 through Figure 4-6 also
apply to devices operating in XT mode. For devices in
RC mode and with the PWRT disabled, on the other
hand, there will be no time-out at all.
Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, all time-outs will expire.
Bringing MCLR high will begin execution immediately
(Figure 4-5). This is useful for testing purposes or to
synchronize more than one PIC18FXXXX device
operating in parallel.
1024 T
PWRTEN = 1
After the POR condition has cleared, PWRT
time-out is invoked (if enabled).
Then, the OST is activated.
1024 T
1024 T
2 ms
OSC
PIC18F2450/4450
—
—
PLL LOCK TIME-OUT
TIME-OUT SEQUENCE
+ 2 ms
OSC
(2)
OSC
PLL
(2)
) is typically 2 ms and follows the
Power-Managed Mode
1024 T
1024 T
1024 T
Exit from
DS39760D-page 45
2 ms
OSC
—
—
+ 2 ms
OSC
(2)
OSC
(2)
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