Motorola 68000

Motorola 68000:

68000 Stack and Queue : 68000 Stack and Queue – 68000 supports stack and queue data structures with the address register indirect position direct and predecrement addressing modes. A stack operates on the principle of Last In First Out (LIFO) and, queue operates on the principle of First In First Out (FIFO). When data is added to a stack or queue, it …


Addressing Modes of 68000 : 68000 utilizes 14 different Addressing Modes of 68000 which can be grouped into 6 basic types. These are 1.Direct Register Addressing a)Data Register Direct b)Address Register Direct 2.Direct Memory Addressing a)Absolute short b)Absolute long. 3.Indirect Memory Addressing a)Register Indirect b)Post-increment Register Indirect c)Pre-decrement Register Indirect d)Register Indirect with Displacement e)Register Indirect with Index and Displacement 4.Implied Register Addressing 5.Program Counter Relative Addressing a)PC-relative with Displacement b)PC-relative with Index and Displacement 6.Immediate Data Addressing a)Immediate b)Quick Immediate Any …


Exceptions Types of Motorola 68000 : Exception means an interrupt processing. Like 8086, Exceptions Types of Motorola 68000 also uses a jump vector table to transfer program control to the appropriate handler program, whenever an exception occurs. Operating Modes of 68000: Exceptions Types of Motorola 68000 can be operated in User or Supervisory mode. When 68000 is reset, it operates in supervisor mode. The …


Instruction Set of 68000 Microprocessor : There are actually 56 basic instructions provided in the Instruction Set of 68000 Microprocessor. 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 required to specify operand. …


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 are seventeen 32-bit data and address registers, a …


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 ‘significant) byte, the lower (least significant) byte, or …


Register Architecture of 68000 Microprocessor : Fig. 11.1 illustrate the Register Architecture of 68000 Microprocessor. Data Registers: The data registers can be used to handle (8-bit) bytes, (16-bit) words, or 32-bit long words. When a data register is used as a source or destination operand, only the appropriate low-order portion of the Register Architecture of 68000 Microprocessor will be altered by the specified operation; …


Updated: May 1, 2020 — 2:48 pm