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OSU8 Microprocessor
CPU Programming
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Tri-State Buffer, Operand Register to 8-Bit Bus

This tri-state buffer allows the Operand Register to drive the main 8-bit data bus. The input is 4-bits, which is driven onto both the upper and lower nibbles of the 8-bit bus. This is required for the immediate load instructions, which 4-bit of data from the operand must be copied into the Accumulator, B Register, or P1 Pointer.

Schematic Drawing

OSU8: Simple 8-Bit Microprocessor Design; Paul Stoffregen
Last updated: February 24, 2005
Status: These pages are a work-in-progress
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