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PIC16C641-04/P Datasheet(PDF) 33 Page - Microchip Technology |
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PIC16C641-04/P Datasheet(HTML) 33 Page - Microchip Technology |
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33 / 136 page  © 1996 Microchip Technology Inc. Preliminary DS30559A-page 33 PIC16C64X & PIC16C66X EXAMPLE 5-2: INITIALIZING PORTB CLRF PORTB ; Initialize PORTB by ; clearing 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 Function RB0/INT bit0 TTL/ST(1) Input/output 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 pin. RB7 bit7 TTL/ST(2) Input/output pin (with interrupt on change). Internal software programmable weak pull-up. Serial programming data pin. Legend: ST = Schmitt Trigger input, TTL = TTL 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. Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on: POR, BOR Value on all other resets 06h PORTB RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0 xxxx xxxx uuuu uuuu 86h TRISB TRISB7 TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0 1111 1111 1111 1111 81h OPTION 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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