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PIC16F720-E/ML 数据表(PDF) 49 Page - Microchip Technology |
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PIC16F720-E/ML 数据表(HTML) 49 Page - Microchip Technology |
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49 / 244 page  2010 Microchip Technology Inc. DS41430A-page 49 PIC16F/LF720/721 6.1.3 ANSELA REGISTER The ANSELA register (Register 6-5) is used to configure the Input mode of an I/O pin to analog. Setting the appropriate ANSELA bit high will cause all digital reads on the pin to be read as ‘0’ and allow analog functions on the pin to operate correctly. The state of the ANSELA bits has no affect on digital output functions. A pin with TRIS clear and ANSEL set will still operate as a digital output, but the Input mode will be analog. This can cause unexpected behavior when executing read-modify-write instructions on the affected port. REGISTER 6-4: IOCA: INTERRUPT-ON-CHANGE PORTA REGISTER U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 — — IOCA5 IOCA4 IOCA3 IOCA2 IOCA1 IOCA0 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 IOCA<5:0>: Interrupt-on-Change PORTA Control bits 1 = Interrupt-on-change enabled(1) 0 = Interrupt-on-change disabled Note 1: Interrupt-on-change also requires that the RABIE bit of the INTCON register be set. REGISTER 6-5: ANSELA: PORTA ANALOG SELECT REGISTER U-0 U-0 U-0 R/W-1 U-0 R/W-1 R/W-1 R/W-1 — — — ANSA4 — ANSA2 ANSA1 ANSA0 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 7-5 Unimplemented: Read as ‘0’ bit 4 ANSA: Analog Select between Analog or Digital Function on Pin RA<4> 0 = Digital I/O. Pin is assigned to port or digital special function. 1 = Analog input. Pin is assigned as analog input(1). Digital input buffer is disabled. bit 3 Unimplemented: Read as ‘0’ bit 2-0 ANSA<2:0>: Analog Select between Analog or Digital Function on Pins RA<2:0>, respectively 0 = Digital I/O. Pin is assigned to port or digital special function. 1 = Analog input. Pin is assigned as analog input(1). Digital input buffer is disabled. Note 1: Setting a pin to an analog input automatically disables the digital input circuitry. Weak pull-ups, if available, are unaffected. The corresponding TRIS bit must be set to Input mode by the user in order to allow external control of the voltage on the pin. |
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