Datasheet

© 2008 Microchip Technology Inc. DS39631E-page 9
PIC18F2420/2520/4420/4520
TABLE 1-1: DEVICE FEATURES
Features PIC18F2420 PIC18F2520 PIC18F4420 PIC18F4520
Operating Frequency DC – 40 MHz DC – 40 MHz DC – 40 MHz DC – 40 MHz
Program Memory (Bytes) 16384 32768 16384 32768
Program Memory
(Instructions)
8192 16384 8192 16384
Data Memory (Bytes) 768 1536 768 1536
Data EEPROM Memory (Bytes) 256 256 256 256
Interrupt Sources 19 19 20 20
I/O Ports Ports A, B, C, (E) Ports A, B, C, (E) Ports A, B, C, D, E Ports A, B, C, D, E
Timers 4 4 4 4
Capture/Compare/PWM Modules 2 2 1 1
Enhanced
Capture/Compare/PWM Modules
0011
Serial Communications MSSP,
Enhanced USART
MSSP,
Enhanced USART
MSSP,
Enhanced USART
MSSP,
Enhanced USART
Parallel Communications (PSP) No No Yes Yes
10-Bit Analog-to-Digital Module 10 Input Channels 10 Input Channels 13 Input Channels 13 Input Channels
Resets (and Delays) POR, BOR,
RESET Instruction,
Stack Full, Stack
Underflow (PWRT, OST),
MCLR
(optional), WDT
POR, BOR,
RESET Instruction,
Stack Full, Stack
Underflow (PWRT, OST),
MCLR (optional), WDT
POR, BOR,
RESET Instruction,
Stack Full, Stack
Underflow (PWRT, OST),
MCLR (optional), WDT
POR, BOR,
RESET Instruction,
Stack Full, Stack
Underflow (PWRT, OST),
MCLR (optional), WDT
Programmable
High/Low-Voltage Detect
Yes Yes Ye s Ye s
Programmable Brown-out Reset Yes Yes Yes Yes
Instruction Set 75 Instructions;
83 with Extended
Instruction Set Enabled
75 Instructions;
83 with Extended
Instruction Set Enabled
75 Instructions;
83 with Extended
Instruction Set Enabled
75 Instructions;
83 with Extended
Instruction Set Enabled
Packages 28-Pin SPDIP
28-Pin SOIC
28-Pin QFN
28-Pin SPDIP
28-Pin SOIC
28-Pin QFN
40-Pin PDIP
44-Pin QFN
44-Pin TQFP
40-Pin PDIP
44-Pin QFN
44-Pin TQFP