PIC18F331-I/SO PIC18F4220-E/ML PIC18F4220-E/P PIC18F4220-E/PT PIC18F4220-I/ML PIC18F4220-I/P PIC18F4220-I/PT PIC18F4220T-I/ML PIC18F4220T-I/PT PIC18F4221-E/ML