How do you know 68b09 datasheet

68b09 datasheet

The Motorola 6809 is an with some features from , introduced circa 1977-78. It was a major advance over both its predecessor, the , and the related . [ Among the significant enhancements introduced in the 6809 were the use of two 8-bit A and B, which could be combined into a single , D , two 16-bit X, Y and two 16-bit . Like the 6800, it included an undocumented address bus test instruction that would exceed the limits of some memory controllers, evoking the nickname [ . This is because the Z80 combines two full but short clock cycles into a relatively long memory access period compared to the clock, while the more asynchronous 6809 instead has relatively short memory access times: depending on version and speed grade, approximately 60% of a single clock cycle was typically available for memory access in a 6809 see data sheets . [ The Motorola 6809 was originally produced in 1 , 1.5 MHz 68A09 and 2 MHz 68B09 speed ratings. However, there is a certain amount of design philosophy similarity e.g., considerable orthogonality and flexible addressing modes , some syntax resemblance, as well as opcode mnemonic similarity, but the 6809 is a derivative of the 6800 whereas the 68000 was a totally new design. Since a CPU designer could hardly guarantee where this code would be located in a future system, the 6809 design focused heavily on support of , code that could be freely located anywhere in the memory map. However, the decisions made by the design team made for a very powerful processor and made possible advanced operating systems like and , which took advantage of the position-independent, re-entrant nature of the 6809 to create multi-user multitasking operating systems. The 6809E was used in the , the , 3 and 4 computers as an optional alternative to their standard , the , the -made home computers clones of the CoCo , and the , , , etc. In France, produced a series of micro-computers based on the 6809E , TO7/70, TO8, TO8D, TO9, TO9Plus, , MO6, MO5E and MO5NR . was an especially prolific user of the processor, which was deployed in arcade hits such as , , , and . There the MB6890 was dubbed the Peach , probably in ironic reference to the popularity of the . It was similar in this to machines produced by , , and several other suppliers. [ [ Leventhal, Lance 1981 . [ – Collection of 6809 instructions, emulators, tools, debuggers, disassemblers and assemblers – By Terry Ritter and Joel Boney, co-designers of the 6809; – Usenet This article was originally based on material from the , which is under the .
68b09 datasheet
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