Question

Explain the functions of the following pin of 8085 Microprocessor:

HOLD

Answer 1

1. It shows that the use of address and data buses is being requested by a peripheral, such as a DMA (Direct Memory Access) controller.
2. As soon as the current machine cycle is finished, the CPU releases the use of the buses after receiving a HOLD request. Internal processing could go on.
3. The HOLD signal is removed, and the CPU regains the bus.