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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC18F4685-I/SP датащи(PDF) 137 Page - Microchip Technology |
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PIC18F4685-I/SP датащи(HTML) 137 Page - Microchip Technology |
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137 / 484 page  © 2007 Microchip Technology Inc. Preliminary DS39761B-page 135 PIC18F2682/2685/4682/4685 10.3 PORTC, TRISC and LATC Registers PORTC is an 8-bit wide, bidirectional port. The corresponding data direction register is TRISC. 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., put the contents of the output latch on the selected pin). The Data Latch register (LATC) is also memory mapped. Read-modify-write operations on the LATC register read and write the latched output value for PORTC. PORTC is multiplexed with several peripheral functions (Table 10-5). The pins have Schmitt Trigger input buffers. When enabling peripheral functions, care should be taken in defining TRIS bits for each PORTC pin. Some peripherals override the TRIS bit to make a pin an output, while other peripherals override the TRIS bit to make a pin an input. The user should refer to the corresponding peripheral section for the correct TRIS bit settings. The contents of the TRISC register are affected by peripheral overrides. Reading TRISC always returns the current contents, even though a peripheral device may be overriding one or more of the pins. EXAMPLE 10-3: INITIALIZING PORTC Note: On a Power-on Reset, these pins are configured as digital inputs. CLRF PORTC ; Initialize PORTC by ; clearing output ; data latches CLRF LATC ; Alternate method ; to clear output ; data latches MOVLW 0CFh ; Value used to ; initialize data ; direction MOVWF TRISC ; Set RC<3:0> as inputs ; RC<5:4> as outputs ; RC<7:6> as inputs |
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