Indirect Addressing Mode Arithmetic Operations Arithmetic Operations Related to Memory Manipulating Addresses Logic Operations Additional Logic Operations RLC vs. RLA Logical Operations Branch Operations Unconditional Branch Machine Control Operand Types Instruction with Immediate Date Addressing Modes Data Formats Using a Register Pair as a Loop Counter Nested Loops for Delay The Non-Vectored Interrupt Process Mode 0 Simple Input or Output Part II.
Disclaimer : BooksWarrior does not own this book pdf, neither created nor scanned. The resulting design would now look like the one on the following slide.
An example for the address range and its relationship to the memory chips would be the Post Office Boxes in the post office. Boxes to are in group 0, boxes to are in group 1 and so on. The upper digit of the box number identifies the group and the lower two digits identify the box within the group.
So, it can address a total of 64K memory locations. If we use memory chips with 1K locations each, then we will need 64 such chips. The 1K memory chip needs 10 address lines to uniquely identify the 1K locations. Keep in mind that the 10 address lines on the chip gives a range of 00 to 11 or H to 3FFH for each of the chips. Changing the combination of the address bits connected to the chip select changes the address range for the memory chip.
This classification is highly dependent on the memory system design. Lets look at memory width. We said that the width is the number of bits in each memory word. We have been assuming so far that our memory chips have the right width. How would you design a byte wide memory system using these chips? One chip will supply 4 of the data bits per address and the other chip supply the other 4 data bits for the same address.
The interrupt process should be enabled using the EI instruction. The checks for an interrupt during the execution of every instruction. The Non-Vectored Interrupt Process 6. When the microprocessor executes the RST instruction received from the device, it saves the address of the next instruction on the stack and jumps to the appropriate entry in the IVT.
The IVT entry must redirect the microprocessor to the actual service routine. The service routine must include the instruction EI to re-enable the interrupt process. At the end of the service routine, the RET instruction returns the execution to where the program was interrupted.
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.
This Book provides an clear examples on each and every topics covered in the contents of the book to provide an every user those who are read to develop their knowledge. The reason is the electronic devices divert your attention and also cause strains while reading eBooks.
Microprocessor Architecture, Programming and Applications with the This book provides a comprehensive treatment of the microprocessor, covering both hardware and software based on the Microprocessor family.
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