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Depending on the device selected and features enabled, there are up to five ports available. Some pins of the I/O ports are multiplexed with an alternate function from the peripheral features on the device. In general, when a peripheral is enabled, that pin may not be used as a general purpose I/O pin.
Each port has three registers for its operation. These registers are:
- TRIS register (data direction register)
- PORT register (reads the levels on the pins of thedevice)
- LAT register (output latch) when Copy Secured MCU PIC18F6527 Internal Flash
The Data Latch (LAT register) is useful for read-modify-write operations on the value that the I/O pins are driving. A simplified model of a generic I/O port, without the interfaces to other peripherals, is shown in Figure 9-1.
PORTA is an 8-bit wide, bidirectional port. The corresponding data direction register is TRISA. Setting a TRISA bit (= 1) will make the corresponding PORTA pin an input (i.e., put the corresponding output driver in a high-impedance mode). Clearing a TRISA bit (= 0) will make the corresponding PORTA pin an output (i.e., put the contents of the output latch on the selected pin) after Copy Secured MCU PIC18F6527 Internal Flash.
