INC

Name

Increment Register

Function

Increments a specified register by 1.

Syntax

INC(R)

Assembled

Binary

0110RRRR

Decimal

96, then incrementing by 1 until 111

Hexadecimal

0x60, then incrementing by 1 until 0x6F

Symbolic

 ../../_images/inc-sym.png

Execution

1 word, 8-bit code and an execution time of 10.3 \({\mu}\) sec

Side-effects

Not Applicable

Implemented

inc

Detailed Description

The address contained within the specified register pair designates either a particular DATA RAM data character, a DATA RAM status character, a RAM output port, or a ROM input/output port. However, the address designates all of these simultaneously; it is up to the programmer to then write the correct I/O or RAM instruction to access the proper entity.

The disassembly of the instruction below shows how the register pair are represented in the opcode.

../../_images/src.png

The register specified in the lower 4 bits of the instruction is incremented by 1. The carry bit will remain unchanged. If the register specified contains a value of 0b1111 and an INC instruction is applied, the register will contain a value of 0b0000, but the carry bit will remain unchanged

Example program

/ Example program
/ Loads the Accumulator with a value of 2
/ places that value in Register 6
/ increments Register 6
/ Register 6 contains a value of 3
        org    ram
        ld     2
        xch    6
        inc    6
        end