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PIC16F873A Datasheet(PDF) 8 Page - Microchip Technology |
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PIC16F873A Datasheet(HTML) 8 Page - Microchip Technology |
8 / 234 page PIC16F87XA DS39582C-page 8 2001-2013 Microchip Technology Inc. TABLE 1-2: PIC16F873A/876A PINOUT DESCRIPTION Pin Name PDIP, SOIC, SSOP Pin# QFN Pin# I/O/P Type Buffer Type Description OSC1/CLKI OSC1 CLKI 9 6 I I ST/CMOS(3) Oscillator crystal or external clock input. Oscillator crystal input or external clock source input. ST buffer when configured in RC mode; otherwise CMOS. External clock source input. Always associated with pin function OSC1 (see OSC1/CLKI, OSC2/CLKO pins). OSC2/CLKO OSC2 CLKO 10 7 O O — Oscillator crystal or clock output. Oscillator crystal output. Connects to crystal or resonator in Crystal Oscillator mode. In RC mode, OSC2 pin outputs CLKO, which has 1/4 the frequency of OSC1 and denotes the instruction cycle rate. MCLR/VPP MCLR VPP 126 I P ST Master Clear (input) or programming voltage (output). Master Clear (Reset) input. This pin is an active low Reset to the device. Programming voltage input. PORTA is a bidirectional I/O port. RA0/AN0 RA0 AN0 227 I/O I TTL Digital I/O. Analog input 0. RA1/AN1 RA1 AN1 328 I/O I TTL Digital I/O. Analog input 1. RA2/AN2/VREF-/ CVREF RA2 AN2 VREF- CVREF 41 I/O I I O TTL Digital I/O. Analog input 2. A/D reference voltage (Low) input. Comparator VREF output. RA3/AN3/VREF+ RA3 AN3 VREF+ 52 I/O I I TTL Digital I/O. Analog input 3. A/D reference voltage (High) input. RA4/T0CKI/C1OUT RA4 T0CKI C1OUT 63 I/O I O ST Digital I/O – Open-drain when configured as output. Timer0 external clock input. Comparator 1 output. RA5/AN4/SS/C2OUT RA5 AN4 SS C2OUT 74 I/O I I O TTL Digital I/O. Analog input 4. SPI slave select input. Comparator 2 output. Legend: I = input O = output I/O = input/output P = power — = Not used TTL = TTL input ST = Schmitt Trigger input Note 1: This buffer is a Schmitt Trigger input when configured as the external interrupt. 2: This buffer is a Schmitt Trigger input when used in Serial Programming mode. 3: This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise. |
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