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PIC16F720-E/ML 数据表(PDF) 57 Page - Microchip Technology |
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PIC16F720-E/ML 数据表(HTML) 57 Page - Microchip Technology |
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57 / 244 page  2010 Microchip Technology Inc. DS41430A-page 57 PIC16F/LF720/721 REGISTER 6-6: PORTB: PORTB REGISTER R/W-x R/W-x R/W-x R/W-x U-0 U-0 U-0 U-0 RB7 RB6 RB5 RB4 — — — — 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 7-4 RB<7:4>: PORTB I/O Pin bit 1 = Port pin is > VIH 0 = Port pin is < VIL bit 3-0 Unimplemented: Read as ‘0’ REGISTER 6-7: TRISB: PORTB TRI-STATE REGISTER R/W-1 R/W-1 R/W-1 R/W-1 U-0 U-0 U-0 U-0 TRISB7 TRISB6 TRISB5 TRISB4 — — — — 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 7-4 TRISB<7:4>: PORTB Tri-State Control bit 1 = PORTB pin configured as an input (tri-stated) 0 = PORTB pin configured as an output bit 3-0 Unimplemented: Read as ‘0’ REGISTER 6-8: WPUB: WEAK PULL-UP PORTB REGISTER R/W-1 R/W-1 R/W-1 R/W-1 U-0 U-0 U-0 U-0 WPUB7 WPUB6 WPUB5 WPUB4 — — — — 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 7-4 WPUB<7:4>: Weak Pull-up PORTB Control bits 1 = Weak pull-up enabled (1,2) 0 = Weak pull-up disabled bit 3-0 Unimplemented: Read as ‘0’ Note 1: Global RABPU bit of the OPTION register must be cleared for individual pull-ups to be enabled. 2: The weak pull-up device is automatically disabled if the pin is in configured as an output. |
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