How to Identify which instructions are represented by this microcode
Microcode instruction sets typically have more fields than ordinary instruction sets.  

Sometimes this is called wide word, as a very long instruction can offer access to multiple hardware components in the same cycle for many operations to be performed in parallel.

In simpler microcoded systems, instead of being wide in the extreme, the numerous (smaller) fields offer access to simple operations (though still in parallel), like read from memory, write, transfer one register to another, etc..

We also generally won't see overlapping fields in microcoded instruction sets, like we do with normal instruction sets.   Look at MIPS for example, which has half a dozen different instruction forms, like J-type and R-type where the fields overlap and the hardware decides how the fields are to be interpreted based on the instruction type.  

In microcode, you just use the fields you need in each microcoded instruction, instead of choosing a different instruction type.  This keeps the micro-machine simpler, at an expense of either needing a wider microcoded instruction set, or having fewer micromachine features, like fewer micromachine registers and/or hardware units (like adders).

Because of the large number of instruction fields in each microcoded instruction, we can expect multiple operations per instruction.

In your example, I think we can assume the following are all encoded in a single instruction:

MAR = PC       // transfer PC to address bus
PC = PC + 1    // increment PC register
IR = MBR       // transfer data bus to IR register
Assert MR      // assert memory read


And it looks like the "put addr 7000 into MAR, Assert MAR" is a programming comment associated with this instruction.



N.S. Matloff
 has a description of a 32-bit microcoded instruction set that looks roughly like what you're showing.  You can see the large number of fields, and also that by comparison to a normal instruction set.  There are fields of the instruction for branching, fields for alu operation, register source &amp; target, memory access, etc..  These fields exist in every instruction; there are no overlapping fields as there is only one instruction type.