Each PIC18F44J11 instruction is a 14-bit word containing the operation code (opcode) and all required operands when Read PIC18F44J11 Microcontroller Flash Program. The opcodes are broken into three broad categories after Read MCU Embedded Firmware.
- Byte Oriented
- Bit Oriented
- Literal and Control
The literal and control category contains the most var- ied instruction word format. Below Table lists the instructions recognized by the MPASMTM assembler.
All instructions are executed within a single instruction cycle before Extract MCU Embedded Firmware, with the following exceptions, which may take two or three cycles:
- Subroutine takes two cycles (CALL, CALLW)
- Returns from interrupts or subroutines take two cycles (RETURN, RETLW, RETFIE)
- Program branching takes two cycles (GOTO, BRA, BRW, BTFSS, BTFSC, DECFSZ, INCSFZ)
- One additional instruction cycle will be used when any instruction references an indirect file register and the file select register is pointing to program memory.
One instruction cycle consists of 4 oscillator cycles; for an oscillator frequency of 4 MHz, this gives a nominal instruction execution rate of 1 MHz. All instruction examples use the format ‘0xhh’ to represent a hexadecimal number by Read IC AT87F52 Firmware, where ‘h’ signifies a hexadecimal digit by Read PIC18F44J11 Microcontroller Flash Program.
Any instruction that specifies a file register as part of the instruction performs a Read-Modify-Write (R-M-W) operation when Extract IC AT87F51 Code. The register is read, the data is modified, and the result is stored according to either the instruction, or the destination designator ‘d’. A read operation is performed on a register even if the instruction writes to that register can be used for the purpose of Microcontroller Unlocking.
