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Description:

The NTE6809 and NTE6809E are revolutionary high performance 8–bit microprocessors in 40–Lead DIP type packages which support modern programming techniques such as position independece, reentrancy, and modular programming.

Architectural Features:

● Two 16–Bit Index Registers

● Two 16–Bit Indexable Stack Pointers

● Two 8–Bit Accumulators can be Concatenated to Form One 16–Bit Accumulator

● Direct Page Register Allows Direct Addressing Throughout Memory

Hardware Features:

● On–Chip Oscillator (Crystal Frequency = 4 x E), NTE6809 Only

● DMA/BREQ Allows DMA Operation on Memory Refresh, NTE6809 Only

● External Clock Inputs, E and Q, Allow Synchronization, NTE6809E Only

● TSC Input Controls Internal Bus Buffers, NTE6809E Only

● LIC Indicates Opcode Fetch, NTE6809E Only

● AVMA Allows Efficient Use of Common Resource in a Multiprocessor System, NTE6809E Only

● BUSY is a Status Line for Multiprocessing, NTE6809E Only

● Fast Interrupt Request Input Stacks Only Condition Code Register and Program Counter

● MRDY Input Extends Data Across Times for Use with Slow Memory

● Interrupt Acknowledge Output Allows Vectoring by Devices

● Sync Acknowledge Output Allows for Synchronization to External Event

● Single Bus–Cycle RESET

● Single 5V Supply Operation

● NMI Inhibited After RESET Until After First Load Stack Pointer

● Early Address Valid Allows Use with Slower Memories

● Early Write Data for Dynamic Memories

Software Features:

● 10 Addressing Modes

? M6800 Upward Compatible Addressing Modes

? Direct Addressing Anywhere in Memory Map

? Long RelativeBranches

? Program Counter Relative

? True Indirect Addressing

? Expanded Indexed Addressing

0–, 5–, 8–, or 16–Bit Constant Offsets

8– or 16–Bit Accumulator Offsets

Auto–Increment/Decrement by 1 or 2

● Improved Stack Manipulation

● 1464 Instruction with Unique Addressing Modes

● 8 x 8 Unsigned Multiply

● 16–Bit Arithmetic

● Transfer/Exchange All Registers

● Push/Pull Any Registers or Any Set of Registers

● Load Effective Address