PIC16LF1827-E/MV Microchip Technology, PIC16LF1827-E/MV Datasheet - Page 73
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PIC16LF1827-E/MV
Manufacturer Part Number
PIC16LF1827-E/MV
Description
7 KB Flash, 384 Bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhanced Mid Range Core, Nan
Manufacturer
Microchip Technology
Series
PIC® XLP™ 16Fr
Specifications of PIC16LF1827-E/MV
Core Processor
PIC
Core Size
8-Bit
Speed
32MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
7KB (4K x 14)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
384 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
28-UFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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6.0
The Reference Clock module provides the ability to
send a divided clock to the clock output pin of the
device (CLKR) and provide a secondary internal clock
source to the Modulator module. This module is avail-
able in all oscillator configurations and allows the user
to select a greater range of clock submultiples to drive
external devices in the application. The reference clock
module includes the following features:
• System clock is the source
• Available in all oscillator configurations
• Programmable clock divider
• Output enable to a port pin
• Selectable duty cycle
• Slew rate control
The Reference Clock module is controlled by the
CLKRCON register (Register 6-1) and is enabled when
setting the CLKREN bit. To output the divided clock sig-
nal to the CLKR port pin, the CLKROE bit must be set.
The CLKRDIV<2:0> bits enable the selection of 8 dif-
ferent clock divider options. The CLKRDC<1:0> bits
can be used to modify the duty cycle of the output
clock
For information on using the reference clock output
with the Modulator module, see Section 22.0 “Data
Signal Modulator”.
6.1
The slew rate limitation on the output port pin can be
disabled. The Slew Rate limitation can be removed by
clearing the CLKRSLR bit in the CLKRCON register.
6.2
Upon any device Reset, the reference clock module is
disabled. The user's firmware is responsible for
initializing the module before enabling the output. The
registers are reset to their default values.
2009 Microchip Technology Inc.
Note 1: If the base clock rate is selected without a
(1)
. The CLKRSLR bit controls slew rate limiting.
REFERENCE CLOCK MODULE
Slew Rate
Effects of a Reset
divider, the output clock will always have
a duty cycle equal to that of the source
clock, unless a 0% duty cycle is selected.
If the clock divider is set to base clock/2,
then 25% and 75% duty cycle accuracy
will be dependent upon the source clock.
Preliminary
6.3
There are two cases when the reference clock output
signal cannot be output to the CLKR pin, if:
• LP, XT, or HS oscillator mode is selected.
• CLKOUT function is enabled.
Even if either of these cases are true, the module can
still be enabled and the reference clock signal may be
used in conjunction with the Modulator module.
6.3.1
If LP, XT, or HS oscillator modes are selected, the
OSC2/CLKR pin must be used as an oscillator input pin
and the CLKR output cannot be enabled. See
Section 5.2
information on different oscillator modes.
6.3.2
The CLKOUT function has a higher priority than the
Reference Clock module. Therefore, if the CLKOUT
function is enabled by the CLKOUTEN bit in Configura-
tion Word 1, F
pin. Reference Section 4.0 “Device Configuration”
for more information.
6.4
As the Reference Clock module relies on the system
clock as its source, and the system clock is disabled in
Sleep, the module does not function in Sleep, even if
an external clock source or the Timer1 clock source is
configured as the system clock. The module outputs
will remain in their current state until the device exits
Sleep.
PIC16F/LF1826/27
Conflicts with the CLKR pin
Operation During Sleep
OSCILLATOR MODES
CLKOUT FUNCTION
“Clock
OSC
/4 will always be output on the port
Source
Types”
DS41391C-page 73
for
more
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