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PIC18C442 Datasheet(PDF) 13 Page - Microchip Technology |
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PIC18C442 Datasheet(HTML) 13 Page - Microchip Technology |
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13 / 304 page  1999-2013 Microchip Technology Inc. DS39026D-page 13 PIC18CXX2 TABLE 1-3: PIC18C4X2 PINOUT I/O DESCRIPTIONS Pin Name Pin Number Pin Type Buffer Type Description DIP PLCC TQFP MCLR/VPP MCLR VPP 12 18 I P ST Master clear (input) or programming voltage (input). Master Clear (Reset) input. This pin is an active low RESET to the device. Programming voltage input. NC — — — These pins should be left unconnected. OSC1/CLKI OSC1 CLKI 13 14 30 I I ST CMOS Oscillator crystal or external clock input. Oscillator crystal input or external clock source input. ST buffer when configured in RC mode, CMOS otherwise. External clock source input. Always associated with pin function OSC1. (See related OSC1/CLKIN, OSC2/CLKOUT pins.) OSC2/CLKO/RA6 OSC2 CLKO RA6 14 15 31 O O I/O — — TTL Oscillator crystal output. Oscillator crystal output. Connects to crystal or resonator in Crystal Oscillator mode. In RC mode, OSC2 pin outputs CLKOUT, which has 1/4 the frequency of OSC1 and denotes the instruction cycle rate. General Purpose I/O pin. PORTA is a bi-directional I/O port. RA0/AN0 RA0 AN0 23 19 I/O I TTL Analog Digital I/O. Analog input 0. RA1/AN1 RA1 AN1 34 20 I/O I TTL Analog Digital I/O. Analog input 1. RA2/AN2/VREF- RA2 AN2 VREF- 45 21 I/O I I TTL Analog Analog Digital I/O. Analog input 2. A/D Reference Voltage (Low) input. RA3/AN3/VREF+ RA3 AN3 VREF+ 56 22 I/O I I TTL Analog Analog Digital I/O. Analog input 3. A/D Reference Voltage (High) input. RA4/T0CKI RA4 T0CKI 67 23 I/O I ST/OD ST Digital I/O. Open drain when configured as output. Timer0 external clock input. RA5/AN4/SS/LVDIN RA5 AN4 SS LVDIN 78 24 I/O I I I TTL Analog ST Analog Digital I/O. Analog input 4. SPI Slave Select input. Low Voltage Detect Input. RA6 See the OSC2/CLKO/RA6 pin. Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output ST = Schmitt Trigger input with CMOS levels I = Input O = Output P = Power OD = Open Drain (no P diode to VDD) |
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