Transcription of Section 9. I/O Ports - Microchip Technology
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Section 9. I/O Ports - Microchip Technology
1997 Microchip Technology Inc. DS31009A page 9-1 M I/O Ports 9 Section 9. I/O Ports HIGHLIGHTS This Section of the manual contains the following major .. and the TRISA Register .. and the TRISB Register .. and the TRISC and the TRISD and the TRISE Register .. and the TRISF Register .. and the TRISG Register .. and the TRISGP Register .. I/O Programming Initialization .. Design Tips .. Related Application Revision History ..9-20 PICmicro MID-RANGE MCU FAMILY DS31009A-page 9-2 1997 Microchip Technology Inc. Introduction General purpose I/O pins can be considered the simplest of peripherals. They allow thePICmicro to monitor and control other devices. To add flexibility and functionality to a device,some pins are multiplexed with an alternate function(s). These functions depend on whichperipheral features are on the device. In general, when a peripheral is functioning, that pin maynot be used as a general purpose I/O most Ports , the I/O pin s direction (input or output) is controlled by the data direction register,called the TRIS register.
PICmicro MID-RANGE MCU FAMILY DS31009A-page 9-4 1997 Microchip Technology Inc. 9.2 PORTA and the TRISA Register The RA4 pin is a Schmitt Trigger input and an open drain output.
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