Is standard logic eating up your project budget? Special purpose MSI and LSI circuits can get expensive. It doesn't take many.
Plus, if you don't already have the parts you have to order them online then wait on shipping. Want them faster? Fine, pay more for shipping and you'll double the price of those chips!
But, if you've got a drawer full of inexpensive small microcontrollers, you can program one of them to replace one or several expensive standard logic circuits. You don't need to know what you need ahead of time. You have more flexibility in PCB layout. They cost less than the more expensive varieties of MSI and LSI.
Plus, many come in packages smaller than the 14, 16, and 20 pin ICs. If you don't need so many lines, you can drop an 8-pin microcontroller into your board and leave space open for other parts.
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