PIC18f4520 Features

Title:PIC18f4520 Features

Features:

Wide operating voltage range :  2.0v to  5.5v

Sink/source current per  I/O : 25mA

Operating Frequency:

     External

-To external RC modes(upto 4Mhz)

-Two external clock modes(upto 40Mhz)  

Internal

-8 user selectable frequency from 31khz to 8Mhz

Resets : POR(Power on reset), BOR(Brown Out reset)

Program memory(Flash) : 32 KB (32768 bytes)

Data memory : 1536 bytes

EEPROM data Memory : 256 bytes

I/O ports : A,B,C,D,E (A-8Pins)(b-8Pins) (C-8Pins)(D-8Pins) (E-4Pins)

—Timers: 4 Timers

-T0 = 8,16 bits

-T1 = 8,16 bits

-T2 = 8 bits

-T3 = 8,16 bits

—Capture/Compare/PWM : 1 CCP

—Interrupts : 20

—Digital communication peripherals :

         -MSSP (I2C,SPI)

         -USART
—Parallel communication : PSP(parallel slave port)

—Analog to Digital converter : (ADC) 13 Channels , each 10 bit

—Analog Comparators : 2

—Instruction Set : 75 Instruction ,83 with extended Instruction set enabled

—Packages : 40 PIN PDIP(plastic dual inline package)

                 44 PIN QFP(quad flat package)

                 44 PIN TQFP(thin quad flat package)

40 PIN PDIP

—
44PIN QFP and TQFP:

Clock Sources and Oscillator Switching:

Oscillator configuration:

1.Crystal Oscillator/Ceramic Resonators mode:

           In XT, LP, HS or HSPLL Oscillator modes, a crystal or ceramic resonator is connected to the OSC1 and OSC2 pins to establish oscillation. Figure 2-1 shows the pin connections.

2.RC oscillator mode:

  —In the RC Oscillator mode, the oscillator frequency divided by 4 is available on theOSC2pin. This signal may be used for test   purposes  or to   synchronize   other  logic.

Resets:

Power on reset:

   —A Power-on Reset pulse is generated on-chip whenever VDD rises above a certain threshold. This allows the  device  to  start  in  the initialized state when  VDD is adequate for operation.

Brown out reset:

—   The BOR threshold is set by the BORV1:BORV0 bits. If BOR is enabled (any values of BOREN1:BOREN0,except ‘00’), any drop of VDD below VBOR  for greater than TBOR will reset the device. A Reset may or may not occur if VDD falls below VBOR for less than TBOR. The chip will remain in Brown-out Reset until VDD rises above VBOR.

—   If the Power-up Timer is enabled, it will be invoked after .VDD rises above VBOR; it then will keep the chip in Reset for an additional time delay.

                                              


                                      For Basic Electronics Kindaly follow this Link:
          http://basicelectonicspalakpatel.blogspot.in/2014/08/the-mosfet-as-switch.html