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PIC18LC452 Datasheet(PDF) 8 Page - Microchip Technology |
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PIC18LC452 Datasheet(HTML) 8 Page - Microchip Technology |
8 / 296 page PIC18CXX2 DS39026B-page 8 Preliminary © 7/99 Microchip Technology Inc. TABLE 1-2: PIC18C2X2 PINOUT I/O DESCRIPTIONS Pin Name Pin Number Pin Type Buffer Type DIP SOIC Description MCLR/VPP MCLR VPP 11 I P ST 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 99 I I ST CMOS 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 10 10 O O I/O — — TTL 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 22 I/O I TTL Analog Digital I/O. Analog input 0. RA1/AN1 RA1 AN1 33 I/O I TTL Analog Digital I/O. Analog input 1. RA2/AN2/VREF- RA2 AN2 VREF- 44 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+ 55 I/O I I TTL Analog Analog Digital I/O. Analog input 3. A/D Reference Voltage (High) input. RA4/T0CKI RA4 T0CKI 66 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 77 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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