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PIC16F877AI/SP 数据表(PDF) 13 Page - Microchip Technology |
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PIC16F877AI/SP 数据表(HTML) 13 Page - Microchip Technology |
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13 / 234 page  2003 Microchip Technology Inc. DS39582B-page 11 PIC16F87XA PORTB is a bidirectional I/O port. PORTB can be software programmed for internal weak pull-up on all inputs. RB0/INT RB0 INT 33 36 8 9 I/O I TTL/ST(1) Digital I/O. External interrupt. RB1 34 37 9 10 I/O TTL Digital I/O. RB2 35 38 10 11 I/O TTL Digital I/O. RB3/PGM RB3 PGM 36 39 11 12 I/O I TTL Digital I/O. Low-voltage ICSP programming enable pin. RB4 37 41 14 14 I/O TTL Digital I/O. RB5 38 42 15 15 I/O TTL Digital I/O. RB6/PGC RB6 PGC 39 43 16 16 I/O I TTL/ST(2) Digital I/O. In-circuit debugger and ICSP programming clock. RB7/PGD RB7 PGD 40 44 17 17 I/O I/O TTL/ST(2) Digital I/O. In-circuit debugger and ICSP programming data. TABLE 1-3: PIC16F874A/877A PINOUT DESCRIPTION (CONTINUED) Pin Name PDIP Pin# PLCC Pin# TQFP Pin# QFN Pin# I/O/P Type Buffer Type Description 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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