The 6800 was an 8-bit microprocessor designed and manufactured by Motorola in 1974. The MC6800 microprocessor was part of the M6800 Microcomputer System that also included serial and parallel interface ICs, RAM, ROM and other support chips. A significant design feature was that the M6800 family of ICs required only a single five-volt power supply; other microprocessors required three voltages. The M6800 Microcomputer System was announced in March 1974 and was in full production by the end of that year.[1][2]
The 6800 architecture and instruction set were influenced by the then popular Digital Equipment Corporation PDP-11 mini computer.[3] The 6800 had a 16-bit address bus address that could access 64 KB of memory and a 8-bit bi-directional data bus. It has 72 instructions with seven addressing modes for a total of 192 opcodes. The original MC6800 could have a clock rate of up to 1 MHz. Later versions had a maximum clock rate of 2 MHz.
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Subject: Motorola 6800 
Sat Nov 27, 2010 2:53 am