AMI > AMI68A09

Modified: March 15, 2005, 10:10 pm

Manufacturer:	AMI
Model:	S68A09EP
Speed:	1.5MHz
Type:	6809
Data Code:	8515
Introduced:	1975
Transistors:	6800
Package:	40PDIP
Process:	3 Micron
Architecture:	8 bit
Used in:	Control applications and Computers
Description:	Enhanced version of the 6800 8-bit microprocessor, Motorola 6809 added many new features: New instructions for loading effective address into registers and exchanging the contents of registers. New stack handling instructions, including instructions for saving and retrieving the contents of one or more registers to/from the stack. In addition to the system stack pointer the 6809 includes additional user stack pointer. New Direct Page register was added to enhance direct addressing mode. Indexed addressing of the 6809 was expanded to provide new addressing modes: indexed addressing using one of 4 registers (2 stack points, X index register or new Y index register) with 5-bit, 8- bit or 16-bit offset, indexed with accumulator offset, indexed with auto-increment or auto- decrement by 1 or 2, and relative to program counter addressing. 16-bit relative branches could be used to build larger position-independent programs. 16-bit data processing. The Motorola 6809 was produced in two versions - with on-chip clock (6809) and with external clock input (6809E). There were many second sources.