Question

What is the use of HOLD and HLDA pin in microprocessor?

• A. DMA operation
• B. Serial interfacing
• C. Interrupt handling
• D. Power save mode

Hint:

DMA handshake signals: \[ \boxed{ \text{HOLD} \rightarrow \text{Bus request} } \] \[ \boxed{ \text{HLDA} \rightarrow \text{Bus granted (Hold Acknowledge)} } \]

Answer 1

The Correct Option is A

Step 1: Recall the function of HOLD and HLDA signals. In a microprocessor, - HOLD is a request signal asking the processor to release the system buses. - HLDA (Hold Acknowledge) indicates that the processor has released the buses.

Step 2: Identify the application. These signals are used to transfer control of the address, data, and control buses to a Direct Memory Access (DMA) controller. Hence, \[ \boxed{\text{DMA operation}} \] is the correct answer. Therefore, \[ \boxed{(A)} \] is the correct answer.