PIC18F6621-I/PT Microchip Technology Inc., PIC18F6621-I/PT Datasheet - Page 157
PIC18F6621-I/PT
Manufacturer Part Number
PIC18F6621-I/PT
Description
64 PIN, 64 KB FLASH, 3840 RAM, 52 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F6621-IPT.pdf
(396 pages)
Specifications of PIC18F6621-I/PT
A/d Inputs
12-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
1024 Bytes
Input Output
54
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
64-pin TQFP
Programmable Memory
64K Bytes
Ram Size
3.8K Bytes
Speed
40 MHz
Timers
2-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F6621-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Part Number:
PIC18F6621-I/PT
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
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The maximum PWM resolution (bits) for a given PWM
frequency is given by the equation:
EQUATION 16-3:
TABLE 16-3:
2005 Microchip Technology Inc.
Timer Prescaler (1, 4, 16)
PR2 Value
Maximum Resolution (bits)
Note:
PWM Resolution (max)
PWM Frequency
If the PWM duty cycle value is longer than
the PWM period, the CCP4 pin will not be
cleared.
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz
=
log
-----------------------------bits
log
2.44 kHz
---------------
F
F
PWM
2 ( )
OSC
FFh
16
14
PIC18F6525/6621/8525/8621
9.77 kHz
FFh
12
4
39.06 kHz
16.4.3
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
2.
3.
4.
5.
6.
FFh
10
1
Select TMR2 or TMR4 by setting or clearing the
T3CCP2:T3CCP1 bits in the T3CON register.
Set the PWM period by writing to the PR2 or
PR4 register
Set the PWM duty cycle by writing to the
CCPR4L register and CCP4CON<5:4> bits.
Make the CCP4 pin an output by clearing the
TRISG<3> bit.
Set TMR2 or TMR4 prescale value, enable
Timer2 or Timer4 by writing to T2CON or
T4CON.
Configure the CCP4 module for PWM operation.
SETUP FOR PWM OPERATION
156.25 kHz
3Fh
1
8
312.50 kHz
1Fh
1
7
DS39612B-page 155
416.67 kHz
6.58
17h
1
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