Answer : Internal interrupt
An internal interrupt is an interrupt that is caused by a machine instruction processed by the computer processor.
A good way to describe an internal interrupt is that it happens when a machine is working through program instructions in a linear way. The machine is going about its work within a single program, without outside interference from peripherals, from the computer operator or from external network signals. Any internal interrupt may happen if a specific program is engineered to stop when it has reached a certain stage of development. When a program requires the operating system to read through a cache or buffer before stopping and becoming available for other tasks, that would be an instance of an internal interrupt.
The internal interrupt is often contrasted with external interrupts, which can happen in many forms.
Reference : Wikipedia