PIC18F2450-I/ML Microchip Technology, PIC18F2450-I/ML Datasheet - Page 25

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

Specifications of PIC18F2450-I/ML

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Core Processor: PIC
• Speed: 48MHz
• Connectivity: UART/USART, USB
• Number Of I /o: 23
• Program Memory Type: FLASH
• 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
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Controller Family/series: PIC18
• No. Of I/o's: 23
• Ram Memory Size: 768Byte
• Cpu Speed: 48MHz
• No. Of Timers: 3
• 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
• 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, 10 Channel
• A/d Bit Size: 10 bit
• A/d Channels Available: 10
• Height: 0.88 mm
• Length: 6 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 6 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: Details

2.0
2.1
Devices in the PIC18F2450/4450 family incorporate a
different oscillator and microcontroller clock system
than the non-USB PIC18F devices. The addition of the
USB module, with its unique requirements for a stable
clock source, make it necessary to provide a separate
clock source that is compliant with both USB low-speed
and full-speed specifications.
To accommodate these requirements, PIC18F2450/
4450 devices include a new clock branch to provide a
48 MHz clock for full-speed USB operation. Since it is
driven from the primary clock source, an additional
system of prescalers and postscalers has been added
to accommodate a wide range of oscillator frequencies.
An overview of the oscillator structure is shown in
Figure 2-1.
Other oscillator features used in PIC18 enhanced
microcontrollers, such as the internal RC oscillator and
clock switching, remain the same. They are discussed
later in this chapter.
2.1.1
The operation of the oscillator in PIC18F2450/4450
devices is controlled through two Configuration registers
and two control registers. Configuration registers,
CONFIG1L and CONFIG1H, select the oscillator mode
and USB prescaler/postscaler options. As Configuration
bits, these are set when the device is programmed and
left
reprogrammed.
The OSCCON register (Register 2-1) selects the Active
Clock mode; it is primarily used in controlling clock
switching in power-managed modes. Its use is
discussed in Section 2.4.1 “Oscillator Control
Register”.
© 2008 Microchip Technology Inc.
in
OSCILLATOR
CONFIGURATIONS
Overview
that
OSCILLATOR CONTROL
configuration
until
the
device
is
2.2
PIC18F2450/4450 devices can be operated in twelve
distinct oscillator modes. In contrast with the non-USB
PIC18 enhanced microcontrollers, four of these modes
involve the use of two oscillator types at once. Users
can program the FOSC3:FOSC0 Configuration bits to
select one of these modes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. INTXT
11. INTIO
12. INTCKO Internal Oscillator used as
XT
XTPLL
HS
HSPLL
EC
ECIO
ECPLL
ECPIO
INTHS
Oscillator Types
PIC18F2450/4450
Crystal/Resonator
Crystal/Resonator with PLL Enabled
High-Speed Crystal/Resonator
High-Speed Crystal/Resonator
with PLL Enabled
External Clock with F
External Clock with I/O on RA6
External Clock with PLL Enabled
and F
External Clock with PLL Enabled,
I/O on RA6
Internal Oscillator used as
Microcontroller Clock Source, HS
Oscillator used as USB Clock Source
Internal Oscillator used as
Microcontroller Clock Source, XT
Oscillator used as USB Clock Source
Internal Oscillator used as
Microcontroller Clock Source, EC
Oscillator used as USB Clock Source,
Digital I/O on RA6
Microcontroller Clock Source, EC
Oscillator used as USB Clock Source,
F
OSC
/4 Output on RA6
OSC
/4 Output on RA6
OSC
DS39760D-page 23
/4 Output