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PIC16F887 Datasheet(PDF) 55 Page - Microchip Technology |
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PIC16F887 Datasheet(HTML) 55 Page - Microchip Technology |
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55 / 338 page  2006-2012 Microchip Technology Inc. DS41291G-page 55 PIC16F882/883/884/886/887 3.5 PORTC and TRISC Registers PORTC is a 8-bit wide, bidirectional port. The corresponding data direction register is TRISC (Register 3-10). Setting a TRISC bit (= 1) will make the corresponding PORTC pin an input (i.e., put the corresponding output driver in a High-Impedance mode). Clearing a TRISC bit (= 0) will make the corresponding PORTC pin an output (i.e., enable the output driver and put the contents of the output latch on the selected pin). Example 3-4 shows how to initialize PORTC. Reading the PORTC register (Register 3-9) reads the status of the pins, whereas writing to it will write to the PORT latch. All write operations are read-modify-write operations. Therefore, a write to a port implies that the port pins are read, this value is modified and then written to the PORT data latch. The TRISC register (Register 3-10) controls the PORTC pin output drivers, even when they are being used as analog inputs. The user should ensure the bits in the TRISC register are maintained set when using them as analog inputs. I/O pins configured as analog input always read ‘0’. EXAMPLE 3-4: INITIALIZING PORTC BANKSEL PORTC ; CLRF PORTC ;Init PORTC BANKSEL TRISC ; MOVLW B‘00001100’ ;Set RC<3:2> as inputs MOVWF TRISC ;and set RC<7:4,1:0> ;as outputs REGISTER 3-9: PORTC: PORTC REGISTER R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x RC7 RC6 RC5 RC4 RC3 RC2 RC1 RC0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 RC<7:0>: PORTC General Purpose I/O Pin bit 1 = Port pin is > VIH 0 = Port pin is < VIL REGISTER 3-10: TRISC: PORTC TRI-STATE REGISTER R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1(1) R/W-1(1) TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 TRISC<7:0>: PORTC Tri-State Control bit 1 = PORTC pin configured as an input (tri-stated) 0 = PORTC pin configured as an output Note 1: TRISC<1:0> always reads ‘1’ in LP Oscillator mode. |
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