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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC12F615 датащи(PDF) 33 Page - Microchip Technology |
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PIC12F615 датащи(HTML) 33 Page - Microchip Technology |
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33 / 168 page  © 2006 Microchip Technology Inc. Preliminary DS41302A-page 31 PIC12F609/615/12HV609/615 4.0 I/O PORT There are as many as six general purpose I/O pins available. Depending on which peripherals are enabled, some or all of the pins may not be available as general purpose I/O. In general, when a peripheral is enabled, the associated pin may not be used as a general purpose I/O pin. 4.1 GPIO and the TRISIO Registers GPIO is a 6-bit wide port with 5 bidirectional and 1 input-only pin. The corresponding data direction register is TRISIO (Register 4-2). Setting a TRISIO bit (= 1) will make the corresponding GPIO pin an input (i.e., disable the output driver). Clearing a TRISIO bit (= 0) will make the corresponding GPIO pin an output (i.e., enables output driver and puts the contents of the output latch on the selected pin). The exception is GP3, which is input only and its TRIS bit will always read as ‘1’. Example 4-1 shows how to initialize GPIO. Reading the GPIO register (Register 4-1) 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. GP3 reads ‘0’ when MCLRE = 1. The TRISIO register controls the direction of the GPIO pins, even when they are being used as analog inputs. The user must ensure the bits in the TRISIO register are maintained set when using them as analog inputs. I/O pins configured as analog input always read ‘0’. EXAMPLE 4-1: INITIALIZING GPIO Note: The ANSEL register must be initialized to configure an analog channel as a digital input. Pins configured as analog inputs will read ‘0’ and cannot generate an interrupt. BANKSEL GPIO ; CLRF GPIO ;Init GPIO BANKSEL ANSEL ; CLRF ANSEL ;digital I/O, ADC clock ;setting ‘don’t care’ MOVLW 0Ch ;Set GP<3:2> as inputs MOVWF TRISIO ;and set GP<5:4,1:0> ;as outputs REGISTER 4-1: GPIO: GPIO REGISTER U-0 U-0 R/W-x R/W-0 R-x R/W-0 R/W-0 R/W-0 — — GP5 GP4 GP3 GP2 GP1 GP0 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 7-6 Unimplemented: Read as ‘0’ bit 5-0 GP<5:0>: GPIO I/O Pin bit 1 = GPIO pin is > VIH 0 = GPIO pin is < VIL REGISTER 4-2: TRISIO: GPIO TRI-STATE REGISTER U-0 U-0 R/W-1 R/W-1 R-1 R/W-1 R/W-1 R/W-1 — — TRISIO5 TRISIO4 TRISIO3 TRISIO2 TRISIO1 TRISIO0 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 7-6 Unimplemented: Read as ‘0’ bit 5-0 TRISIO<5:0>: GPIO Tri-State Control bit 1 = GPIO pin configured as an input (tri-stated) 0 = GPIO pin configured as an output Note 1: TRISIO<3> always reads ‘1’. 2: TRISIO<5:4> always reads ‘1’ in XT, HS and LP Oscillator modes. |
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