I need a brief description of the meaning of the TEMP EQUs, DVAR EQU, and The flag EQU. it seems is like a subtraction and the result needs to be store into a register or place. This is a machine language for a microcontroller

#include ; This is the header file you created for this lab#1 KEY EQU OXOC ;This is the user defined DRAM area that COUNT EQU OXOD ;uses the 68 bytes GPR: range from OXOC-OX4F TEMP EQU OXOE TEMP1 EQU OXOF TEMP2 EQU OX10 DVAR EQU OX11 DVAR2 EQU OX12 FLAG EQU OX13