Motorola 68000 Instruction Set: There are actually 56 basic instructions provided in the Motorola 68000 Instruction Set. With 14 addressing modes, 56 instructions, and 5 data types, the 68000 includes more than 1000 opcodes. The basic format of all the instructions is same. The opcode for every instruction is one word. Additional extension words are […]
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Motorola 68000 Pins and Signals: Fig. 11.3 illustrates the Motorola 68000 Pins and Signals. Data Transfer Control and Address Lines: D0-D15 is the bi-directional 16-bit data bus. A1-A23 is the output 24-bit address bus. The UDS (Upper Data Strobe) and LDS (Lower Data Strobe) signals determine whether data is being transferred on either the upper (most
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Motorola 68000 Features: The Motorola 68000 microprocessor is Motorola’s first 16-bit microprocessor. The 68000 is not program compatible with Motorola’s family of 8-bit microprocessors. For the designing of instruction set the Motorola has given more trace on its powerfulness and simplicity rather than compatibility. The Motorola 68000 Features are 1.It is a 16-bit microprocessor. 2.There
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Program Execution Transfer Instructions in 8086 Microprocessor: The Program Execution Transfer Instructions in 8086 Microprocessor are namely a) Unconditional transfer instructions: CALL RET JMP J cond CALL Instruction : The CALL instruction is used to Program Execution Transfer Instructions in 8086 Microprocessor to a subprogram or procedure. There are two basic types of CALLs, near
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Intel 8086 Microprocessor: 8086 Addressing Modes : We have seen how the 8086 fetches code bytes from memory by generating 20-bit physical address with the help of IP and CS. We have also seen how the 8086 accesses the stack using SS and SP. In this section we will see the different ways that an
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8086 Addressing Modes: We have seen how the 8086 fetches code bytes from memory by generating 20-bit physical address with the help of IP and CS. We have also seen how the 8086 accesses the stack using SS and SP. In this section we will see the different ways that an 8086 can access the
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Internal Architecture of 8086: Fig. 6.2 shows a block diagram of Internal Architecture of 8086. It is internally divided into two separate functional units. These are the Bus Interface Unit (BIU) and the Execution Unit (EU). These two functional units can work simultaneously to increase system speed and hence the throughput. Throughput is a measure
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Features of 8086 Microprocessor: The features of 8086 Microprocessor are : 1.The 8086 is a 16-bit microprocessor. The term “16-bit” means that its arithmetic logic unit, internal registers and most of its instructions are designed to work with 16-bit binary words. 2.The 8086 has a 16-bit data bus, so it can read data from or
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8085 Programming Model: 8085 Instruction Classification : The programming model assists you in the programming process. The programming model shows only those parts of the microprocessor which the programmer can change. So we can say that block diagram makes it easier to understand the architecture of a microprocessor and the 8085 Programming Model in Microprocessor
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Addressing Modes of 8085 Microprocessor: Part of the programming flexibility for each microprocessor is the number and different kind of ways the programmer can refer to data stored in the memory. The different ways that a microprocessor can access data are referred to as addressing modes. Addressing Modes of 8085 Microprocessor are : Immediate Addressing
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