PIC18F2321 PIC18F2321-E/ML PIC18F2321-E/SO PIC18F2321-E/SP PIC18F2321-E/SS PIC18F2321-E/SS020 PIC18F2321-E/SS023 PIC18F2321-E-SS PIC18F2321-I/ML PIC18F2321-I/SO