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PIC16F84A Datasheet(PDF) 24 Page - Microchip Technology |
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PIC16F84A Datasheet(HTML) 24 Page - Microchip Technology |
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24 / 124 page  PIC16F8X DS30430C-page 24 © 1998 Microchip Technology Inc. EXAMPLE 5-1: INITIALIZING PORTB CLRF PORTB ; Initialize PORTB by ; setting output ; data latches BSF STATUS, RP0 ; Select Bank 1 MOVLW 0xCF ; Value used to ; initialize data ; direction MOVWF TRISB ; Set RB<3:0> as inputs ; RB<5:4> as outputs ; RB<7:6> as inputs TABLE 5-3 PORTB FUNCTIONS TABLE 5-4 SUMMARY OF REGISTERS ASSOCIATED WITH PORTB Name Bit Buffer Type I/O Consistency Function RB0/INT bit0 TTL/ST(1) Input/output pin or external interrupt input. Internal software programmable weak pull-up. RB1 bit1 TTL Input/output pin. Internal software programmable weak pull-up. RB2 bit2 TTL Input/output pin. Internal software programmable weak pull-up. RB3 bit3 TTL Input/output pin. Internal software programmable weak pull-up. RB4 bit4 TTL Input/output pin (with interrupt on change). Internal software programmable weak pull-up. RB5 bit5 TTL Input/output pin (with interrupt on change). Internal software programmable weak pull-up. RB6 bit6 TTL/ST(2) Input/output pin (with interrupt on change). Internal software programmable weak pull-up. Serial programming clock. RB7 bit7 TTL/ST(2) Input/output pin (with interrupt on change). Internal software programmable weak pull-up. Serial programming data. Legend: TTL = TTL input, ST = Schmitt Trigger. 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. Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on Power-on Reset Value on all other resets 06h PORTB RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0/INT xxxx xxxx uuuu uuuu 86h TRISB TRISB7 TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0 1111 1111 1111 1111 81h OPTION_ REG RBPU INTEDG T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111 Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB. |
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