PIC16LF1827-I/SO Microchip Technology, PIC16LF1827-I/SO Datasheet - Page 212

• Manufacturer Part Number: PIC16LF1827-I/SO
• Description: IC MCU 8BIT 4KB FLASH 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16LF1827-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K x 14)
• Package / Case: 18-SOIC (7.5mm Width)
• 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
• 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 ~ 85°C
• Processor Series: PIC16LF
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 384 B
• Interface Type: I2C/SPI/UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 5
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12-ch x 10-bit
• On-chip Dac: 5 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC16F/LF1826/27
23.5.1
The PWM period is specified by the PRx register of
Timerx. The PWM period can be calculated using the
formula of Equation 23-1.
EQUATION 23-1:
When TMRx is equal to PRx, the following three events
occur on the next increment cycle:
• TMRx is cleared
• The CCPx pin is set. (Exception: If the PWM duty
• The PWM duty cycle is latched from CCPRxL into
DS41391B-page 212
cycle = 0%, the pin will not be set.)
CCPRxH.
Note:
Note 1:
PWM Period
PWM PERIOD
The Timerx postscaler (see Section 21.1
“Timer2/4/6 Operation”) is not used in the
determination of the PWM frequency.
T
OSC
=
(TMRx Prescale Value)
[
PWM PERIOD
= 1/F
(
PRx
OSC
)
+
1
] 4 T
•
•
OSC
•
Preliminary
23.5.2
The PWM duty cycle is specified by writing a 10-bit
value to multiple registers: CCPRxL register and
DCxB<1:0> bits of the CCPxCON register. The
CCPRxL contains the eight MSbs and the DCxB<1:0>
bits of the CCPxCON register contain the two LSbs.
CCPRxL and DCxB<1:0> bits of the CCPxCON
register can be written to at any time. The duty cycle
value is not latched into CCPRxH until after the period
completes (i.e., a match between PRx and TMRx
registers occurs). While using the PWM, the CCPRxH
register is read-only.
Equation 23-2 is used to calculate the PWM pulse
width.
Equation 23-3 is used to calculate the PWM duty cycle
ratio.
EQUATION 23-2:
EQUATION 23-3:
The CCPRxH register and a 2-bit internal latch are
used to double buffer the PWM duty cycle. This double
buffering is essential for glitchless PWM operation.
The 8-bit timer TMRx register is concatenated with either
the 2-bit internal system clock (F
prescaler, to create the 10-bit time base. The system
clock is used if the Timerx prescaler is set to 1:1.
When the 10-bit time base matches the CCPRxH and
2-bit latch, then the CCPx pin is cleared (see
Figure 23-3).
Duty Cycle Ratio
Pulse Width
PWM DUTY CYCLE
=
(
T
=
CCPRxL:CCPxCON<5:4>
OSC
PULSE WIDTH
DUTY CYCLE RATIO
(
---------------------------------------------------------------------- -
CCPRxL:CCPxCON<5:4>
© 2009 Microchip Technology Inc.
•
(TMRx Prescale Value)
4 PRx
(
OSC
), or 2 bits of the
+
1
)
)
•
)