How does the following work?
- (i)READY
- (ii)INTR
- (iii)NMI
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker.
(i)READY:
This is the acknowledgement from the memory or slow device that they have completed the data transfer. The signal made available by the devices is synchronized by the 8284A clock generator to provide ready input to the microprocessor. The signal is active high(1).
(ii)INTR:
The INTR is a maskable interrupt because the microprocessor will be interrupted only if interrupts are enabled using set interrupt flag instruction. It should not be enabled using clear interrupt Flag instruction.
The INTR interrupt is activated by an I/O port. If the interrupt is enabled and NMI is disabled, then the microprocessor first completes the current execution and sends ‘0’ on INTA pin twice. The first ‘0’ means INTA informs the external device to get ready and during the second ‘0’ the microprocessor receives the 8 bit, say X, from the programmable interrupt controller.
These actions are taken by the microprocessor −
(iii)NMI:
It is a single non-maskable interrupt pin (NMI) having higher priority than the maskable interrupt request pin (INTR)and it is of type 2 interrupt.
When this interrupt is activated, these actions take place −