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8-BIT MICROPROCESSING UNIT (MPU)

The MC6800 is a monolithic 8-bit microprocessor forming the central control function for Motorola’s M68~ family. Compatible with TTL, the MC6B~, as with all M6800 system parts, requires only one + 5.O-volt power supply, and no external TTL devices for bus interface.

The MC6800 is capable of addressing 64K bytes of memory with its 16-bit address lines. The 8-bit data bus is bidirectional as well as three state, making direct memory addressing and multiprocessing applications realizable.

● 8-Bit Parallel Processing

● Bidirectional Data Bus

● 16-Bit Address Bus – WK Bytes of Addressing

● 72 Instructions – Variable Length

● Seven Addressing Modes – Direct, Relative, Immediate, Indexed, Extended, Implied and Accumulator

● Variable Length Stack

● Vectored Restart

● Maskable Interrupt Vector

● Simplified Clocking Characteristics

● Clock Rates as High as 2.0 MHz

● Simple Bus Interface Without TTL

● Separate Non-Maskable Interrupt – Internal Registers Saved in Stack

● Six Internal Registers – Two Accumulators, Index Register Program Counter, Stack Pointer and Condition Code Register

● Direct Memory Addressing (D MA) and Multiple Processor Capability