PIC18F4450-I/P Microchip Technology, PIC18F4450-I/P Datasheet - Page 26
PIC18F4450-I/P
Manufacturer Part Number
PIC18F4450-I/P
Description
IC PIC MCU FLASH 8KX16 40DIP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC18F2221-ISO.pdf
(46 pages)
2.PIC18F2450-ISO.pdf
(324 pages)
3.PIC18F2450-ISO.pdf
(6 pages)
4.PIC18F2450-ISO.pdf
(8 pages)
5.PIC18F2450-ISO.pdf
(4 pages)
6.PIC18F2450-ISO.pdf
(4 pages)
7.PIC18F4450-IP.pdf
(322 pages)
Specifications of PIC18F4450-I/P
Program Memory Type
FLASH
Program Memory Size
16KB (8K x 16)
Package / Case
40-DIP (0.600", 15.24mm)
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
34
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 13x10b
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
34
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, DM163025, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
13-ch x 10-bit
Package
40PDIP
Device Core
PIC
Family Name
PIC18
Maximum Speed
48 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
DM163025 - PIC DEM FULL SPEED USB DEMO BRD444-1001 - DEMO BOARD FOR PICMICRO MCU
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F4450-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC18F2221-ISO PDF datasheet
- PIC18F2450-ISO PDF datasheet #2
- PIC18F2450-ISO PDF datasheet #3
- PIC18F2450-ISO PDF datasheet #4
- PIC18F2450-ISO PDF datasheet #5
- PIC18F2450-ISO PDF datasheet #6
- PIC18F4450-IP PDF datasheet #7
- Current page: 26 of 324
- Download datasheet (6Mb)
PIC18F2450/4450
2.2.1
Because of the unique requirements of the USB
module, a different approach to clock operation is
necessary. In previous PIC
and peripheral clocks were driven by a single oscillator
source; the usual sources were primary, secondary or
the internal oscillator. With PIC18F2450/4450 devices,
the primary oscillator becomes part of the USB module
and cannot be associated to any other clock source.
Thus, the USB module must be clocked from the
primary clock source; however, the microcontroller
core and other peripherals can be separately clocked
from the secondary or internal oscillators as before.
FIGURE 2-1:
DS39760D-page 24
T1OSO
T1OSI
OSC2
OSC1
OSCILLATOR MODES AND
USB OPERATION
Primary Oscillator
Secondary Oscillator
PIC18F2450/4450 CLOCK DIAGRAM
XT, HS, EC, ECIO
Sleep
T1OSCEN
Enable
Oscillator
®
microcontrollers, all core
Internal RC Oscillator
31.25 kHz
÷ 4
÷ 3
÷ 2
÷ 1
CPUDIV<1:0>
÷ 12
÷ 10
÷ 6
÷ 5
÷ 4
÷ 3
÷ 2
÷ 1
PIC18F2450/4450
PLLDIV<2:0>
11
10
01
00
111
110
101
100
011
010
001
000
HSPLL, ECPLL,
XTPLL, ECPIO
(4 MHz Input Only)
OSCCON<6:4>
Because of the timing requirements imposed by USB,
an internal clock of either 6 MHz or 48 MHz is required
while the USB module is enabled. Fortunately, the
microcontroller and other peripherals are not required
to run at this clock speed when using the primary
oscillator. There are numerous options to achieve the
USB module clock requirement and still provide flexi-
bility for clocking the rest of the device from the primary
oscillator source. These are detailed in Section 2.3
“Oscillator Settings for USB”.
96 MHz
PLL
÷ 6
÷ 4
÷ 3
÷ 2
CPUDIV<1:0>
11
10
01
00
FOSC3:FOSC0
÷ 2
Internal Oscillator
USBDIV
1
0
FOSC3:FOSC0
0
1
Primary
Clock
T1OSC
© 2008 Microchip Technology Inc.
USB Clock Source
÷ 4
Clock Source Option
for Other Modules
WDT, PWRT, FSCM
and Two-Speed Start-up
Control
Clock
OSCCON<1:0>
FSEN
1
0
IDLEN
Peripherals
Peripheral
USB
CPU
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