Therefore, the INTR must remain active for Otherwise, the microprocessor will be interrupted again. Masking RST 5. Maskable Interrupts RST7. If there is an interrupt, and if the interrupt is enabled using the interrupt mask, the microprocessor will complete the executing instruction, and reset the interrupt flip flop. The microprocessor then executes a call instruction that sends the execution to the appropriate location in the interrupt vector table.
When the microprocessor executes the call instruction, it saves the address of the next instruction on the stack. The microprocessor jumps to the specific service routine. Accumulator M7. MSE M7. Interfacing the A to the Dev. After that, the following sequence occurs: 1. One or more interrupts come in. The A resolves the interrupt priorities based on its internal settings 3. The microprocessor responds with an INTA signal and turns off the interrupt enable flip flop.
Operating of the A 6. When the microprocessor receives the op-code for CALL instead of RST, it recognizes that the device will be sending 16 more bits for the address. The microprocessor sends a second INTA signal. The microprocessor sends a third INTA signal. The result should be 0. The packaging technology of time limited the number of pin that could be used. In particular, the address lines 0 - 15 are multiplexed with data lines , address lines are multiplexed with status lines.
This is an active low signal that is asserted when there is data on the upper half of the data bus. The has two modes of operation that changes the function of some pins. This is a simple single processor mode. This is the mode required for a coprocessor like the HOLD When this pin is high, another master is requesting control of the local bus, e. This signal is used to capture the address in latches to establish the address bus.
Must be high for 4 clocks. Used with Used for emergencies such as power failure. In the , these bytes come in on the 8-bit data bus.
In the , bytes at even addresses come in on the low half of the data bus bits and bytes at odd addresses come in on the upper half of the data bus bits The can read a bit word at an even address in one operation and at an odd address in two operations.
The needs two operations in either case. The least significant byte of a word on an family microprocessor is at the lower address. Data is fetched using a segment register usually the DS and an effective address EA computed by the EU depending on the addressing mode. This allows byte operations and compatibility with the previous generation of 8-bit processors, the and It also contains information which controls the operation of the microprocessor.
The offset is given by the IP for the Code Segment. Instructions are always fetched with using the CS register. The physical address is also called the absolute address. The stack is always referenced with respect to the stack segment register.
The stack grows toward decreasing memory locations. The SP points to the last or top item on the stack. Aspirants who are looking for the free microprocessor by ramesh gaonkar ebook pdf download can easily avail from the below download link. Part II. Additional Logic Operations Tags for this Thread microprocessor ramesh gaonkar pdf downloadcomputer engineering ebooksengineering ebooksengineering ebooks free downloadengineering forumgaonkar microprocessor pdfmicroprocessormicroprocessor architecture programming and applications with the by ramesh gaonkar pdf.
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