PIC18F2450-I/SO Microchip Technology, PIC18F2450-I/SO Datasheet - Page 130

• Manufacturer Part Number: PIC18F2450-I/SO
• Description: IC PIC MCU FLASH 8KX16 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2450-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 16KB (8K x 16)
• Package / Case: 28-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: UART/USART, USB
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 23
• 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/USB
• Maximum Clock Frequency: 48 MHZ
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• 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: 28SOIC W
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 48 MHz
• A/d Bit Size: 10 bit
• A/d Channels Available: 10
• Height: 2.31 mm
• Length: 17.87 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 7.49 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164322 - MODULE SOCKET MPLAB PM3 28/44QFNDM163025 - PIC DEM FULL SPEED USB DEMO BRD
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F2450/4450
The CCPR1H 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.
When the CCPR1H and 2-bit latch match TMR2,
concatenated with an internal 2-bit Q clock or 2 bits of
the TMR2 prescaler, the CCP1 pin is cleared.
The maximum PWM resolution (bits) for a given PWM
frequency is given by the equation:
EQUATION 13-3:
TABLE 13-3:
TABLE 13-4:
DS39760C-page 128
INTCON
RCON
PIR1
PIE1
IPR1
TRISC
TMR2
PR2
T2CON
CCPR1L
CCPR1H
CCP1CON
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by PWM or Timer2.
Note 1:
Timer Prescaler (1, 4, 16)
PR2 Value
Maximum Resolution (bits)
Note:
Name
PWM Resolution (max)
PWM Frequency
The SBOREN bit is only available when BOREN<1:0> = 01; otherwise, the bit reads as ‘0’.
If the PWM duty cycle value is longer than
the PWM period, the CCP1 pin will not be
cleared.
Timer2 Register
Timer2 Period Register
Capture/Compare/PWM Register 1 Low Byte
Capture/Compare/PWM Register 1 High Byte
GIE/GIEH PEIE/GIEL
TRISC7
IPEN
Bit 7
—
—
—
—
—
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz
REGISTERS ASSOCIATED WITH PWM AND TIMER2
SBOREN
T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0
TRISC6
ADIF
ADIE
ADIP
Bit 6
—
=
log
-----------------------------bits
(1)
2.44 kHz
log
⎛
⎝
---------------
F
F
FFh
PWM
16
10
2 ( )
TMR0IE
OSC
DC1B1
RCIF
RCIE
RCIP
Bit 5
—
—
⎞
⎠
9.77 kHz
Preliminary
DC1B0
INT0IE
FFh
Bit 4
TXIF
TXIE
TXIP
10
4
RI
—
CCP1M3
39.06 kHz
13.4.3
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
2.
3.
4.
5.
RBIE
Bit 3
TO
FFh
—
—
—
—
10
1
Set the PWM period by writing to the PR2
register.
Set the PWM duty cycle by writing to the
CCPR1L register and CCP1CON<5:4> bits.
Make the CCP1 pin an output by clearing the
appropriate TRIS bit.
Set the TMR2 prescale value, then enable
Timer2 by writing to T2CON.
Configure the CCP module for PWM operation.
CCP1M2
SETUP FOR PWM OPERATION
TMR0IF
CCP1IF
CCP1IE
CCP1IP
TRISC2
156.25 kHz
Bit 2
PD
3Fh
1
8
CCP1M1 CCP1M0
TMR2IF
TMR2IE
TMR2IP
TRISC1
© 2007 Microchip Technology Inc.
INT0IF
Bit 1
POR
312.50 kHz
1Fh
1
7
TMR1IE
TMR1IP
TMR1IF
TRISC0
RBIF
Bit 0
BOR
416.67 kHz
6.58
on Page:
17h
Values
1
Reset
50
50
50
50
49
50
51
51
51
51
50
50