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PORTB is an 8-bit wide, bidirectional port. In this example, we are assigning value of to the W working register. Example of indirect addressing: INDF register is not an actual register it is a virtual register that is not found in any bank. Each time the main program execution starts at address – Reset Vector. Xours tenth push overwrites the second push and so on.
The running program is working only with one bank at all time. While program is being executed, it is working with the particular bank.
We are allowed to use the names of the ports without considering their addresses. Then, we are adding the value of and the W register together. The following table demonstrates, which of the Banks the program is working with, based on the selection of the RP0 and RP1 bits: The data memory is partitioned into multiple banks which contain the General Purpose Registers and the Special Function Registers.
The role of the PORT register is to receive the information from an external source e. Register W will contain the reminder: There are six SFRs used to read and write to this memory: In order to start programming and build automated system, there is no need to study all the registers of the memory map, but only a few most important ones:.
Program Memory – A memory that contains the program which we had writtenafter we’ve burned it. In most cases, this register is used to switch between the banks Register Bank Selectbut also has other capabilities.
The following figure shows the two addressing methods: Here’s a map of the locations:.
Movlw Addwf0 In this example, we are assigning value of to the W working register. If not set otherwise, then as stated, the default bank is BANK0.
The lower locations of each bank are reserved for the Special Function Registers.
The variables that we store in the Data Memory during the program are deleted after we turn of the micro. Here is a code where we use interrupt: Program Counter PC keeps track of the program execution by holding the address of the current instruction.
The default bank is BANK0. When the IRP Equal to 1, the program will work with banks 2, 3.
PIC microcontroller memory organization tutorial
To the left you can see the direct addressing method, where the bank selection is made by RP bits and the referencing is made directly from memory Opcode by using the variable name. Here’s a map of the locations: If pif plan to use an interrupt, our program will begin after the Interrupt Vector; and if not we can start to write from the beginning of the Reset Vector.
Each pin is individually configurable as an input or output. On devices with bytes, addresses from 80h to FFh are unimplemented.
If you want to set a specific port as exit you must change the state of the TRIS to 0. Instead, it is indirectly addressed through the Special Function Registers.