Specifications

Chapter 2 - Microcontroller PIC16F84
In instructions with two operands, ordinarily one operand is in work register (W register), and the
other is one of the registers or a constant. By operand we mean the contents on which some
operation is being done, and a register is any one of the GPR or SFR registers. GPR is an
abreviation for 'General Purposes Registers', and SFR for 'Special Function Registers'. In
instructions with one operand, an operand is either W register or one of the registers. As an
addition in doing operations in arithmetic and logic, ALU controls status bits (bits found in STATUS
register). Execution of some instructions affects status bits, which depends on the result itself.
Depending on which instruction is being executed, ALU can affect values of Carry (C), Digit Carry
(DC), and Zero (Z) bits in STATUS register.
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