PIC18F4550-I/PT Microchip Technology Inc., PIC18F4550-I/PT Datasheet - Page 26

• Manufacturer Part Number: PIC18F4550-I/PT
• Description: 44 PIN, 32 KB FLASH, 2048 RAM, FS-USB 2.0
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4550-I/PT

• A/d Inputs: 13-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 12 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 34
• Interface: I2C/SPI/UART/USART/USB
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin TQFP
• Programmable Memory: 32K Bytes
• Ram Size: 2K Bytes
• Speed: 48 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC18F2455/2550/4455/4550
FIGURE 2-1:
DS39632C-page 24
T1OSO
T1OSI
OSC2
OSC1
Primary Oscillator
Secondary Oscillator
PIC18F2455/2550/4455/4550 CLOCK DIAGRAM
XT, HS, EC, ECIO
OSCCON<6:4>
Oscillator
Internal
Source
INTRC
Source
8 MHz
Block
T1OSCEN
Enable
Oscillator
Sleep
31 kHz (INTRC)
(INTOSC)
8 MHz
4
3
2
1
CPUDIV
12
10
6
5
4
3
2
1
Preliminary
PIC18F2455/2550/4455/4550
11
10
01
00
PLLDIV
111
110
101
100
011
010
001
000
1
0
500 kHz
250 kHz
125 kHz
31 kHz
8 MHz
4 MHz
2 MHz
1 MHz
HSPLL, ECPLL,
XTPLL, ECPIO
(4 MHz Input Only)
OSCCON<6:4>
OSCTUNE<7>
96 MHz
111
110
101
100
011
010
001
000
PLL
6
4
3
2
CPUDIV
11
10
01
00
FOSC3:FOSC0
2
Internal Oscillator
USBDIV
1
0
FOSC3:FOSC0
0
1
T1OSC
Primary
Clock
USB Clock Source
© 2006 Microchip Technology Inc.
Clock Source Option
for other Modules
WDT, PWRT, FSCM
and Two-Speed Start-up
4
Control
Clock
OSCCON<1:0>
IDLEN
FSEN
1
0
Peripherals
Peripheral
CPU
USB