PIC18F2420-I/ML Microchip Technology, PIC18F2420-I/ML Datasheet - Page 161

• Manufacturer Part Number: PIC18F2420-I/ML
• Description: IC PIC MCU FLASH 8KX16 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2420-I/ML

• Program Memory Type: FLASH
• Program Memory Size: 16KB (8K x 16)
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 25
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: EUSART, I2C, MSSP, SPI
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 25
• 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, DM163014, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• Package: 28QFN EP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT28QFN4 - SOCKET TRANS ICE 28QFN W/CABLEAC164322 - MODULE SOCKET MPLAB PM3 28/44QFN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

16.4.9
The following steps should be taken when configuring
the ECCP module for PWM operation:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Enable PWM outputs after a new PWM cycle
© 2008 Microchip Technology Inc.
Configure the PWM pins, P1A and P1B (and
P1C and P1D, if used), as inputs by setting the
corresponding TRIS bits.
Set the PWM period by loading the PR2 register.
If auto-shutdown is required:
• Disable auto-shutdown (ECCPASE = 0)
• Configure source (FLT0, Comparator 1 or
• Wait for non-shutdown condition
Configure the ECCP module for the desired
PWM mode and configuration by loading the
CCP1CON register with the appropriate values:
• Select one of the available output
• Select the polarities of the PWM output
Set the PWM duty cycle by loading the CCPR1L
register and CCP1CON<5:4> bits.
For Half-Bridge Output mode, set the dead-
band delay by loading PWM1CON<6:0> with
the appropriate value.
If auto-shutdown operation is required, load the
ECCP1AS register:
• Select the auto-shutdown sources using the
• Select the shutdown states of the PWM
• Set the ECCPASE bit (ECCP1AS<7>).
• Configure the comparators using the CMCON
• Configure the comparator inputs as analog
If auto-restart operation is required, set the
PRSEN bit (PWM1CON<7>).
Configure and start TMR2:
• Clear the TMR2 interrupt flag bit by clearing
• Set the TMR2 prescale value by loading the
• Enable Timer2 by setting the TMR2ON bit
has started:
• Wait until TMRx overflows (TMRxIF bit is set).
• Enable the CCP1/P1A, P1B, P1C and/or P1D
• Clear the ECCPASE bit (ECCP1AS<7>).
Comparator 2)
configurations and direction with the
P1M<1:0> bits.
signals with the CCP1M<3:0> bits.
ECCPAS<2:0> bits.
output pins using the PSSAC<1:0> and
PSSBD<1:0> bits.
register.
inputs.
the TMR2IF bit (PIR1<1>).
T2CKPS bits (T2CON<1:0>).
(T2CON<2>).
pin outputs by clearing the respective TRIS
bits.
SETUP FOR PWM OPERATION
PIC18F2420/2520/4420/4520
16.4.10
In Sleep mode, all clock sources are disabled. Timer2
will not increment and the state of the module will not
change. If the ECCP pin is driving a value, it will con-
tinue to drive that value. When the device wakes up, it
will continue from this state. If Two-Speed Start-ups are
enabled, the initial start-up frequency from INTOSC
and the postscaler may not be stable immediately.
In PRI_IDLE mode, the primary clock will continue to
clock the ECCP module without change. In all other
power-managed modes, the selected power-managed
mode clock will clock Timer2. Other power-managed
mode clocks will most likely be different than the
primary clock frequency.
16.4.10.1
If the Fail-Safe Clock Monitor is enabled, a clock failure
will force the device into the power-managed RC_RUN
mode and the OSCFIF bit (PIR2<7>) will be set. The
ECCP will then be clocked from the internal oscillator
clock source, which may have a different clock
frequency than the primary clock.
See the previous section for additional details.
16.4.11
Both Power-on Reset and subsequent Resets will force
all ports to Input mode and the CCP registers to their
Reset states.
This forces the Enhanced CCP module to reset to a
state compatible with the standard CCP module.
OPERATION IN POWER-MANAGED
MODES
EFFECTS OF A RESET
Operation with Fail-Safe
Clock Monitor
DS39631E-page 159