I can still remember fiddling with my very first PIC project, which was based on (at that moment in time) the brand new and unbelievable PIC16C54. I don’t recall ever complaining about the size of the PIC16C54 SRAM or its 1 µs instruction cycle time. And, I don’t recall ever filling up a PIC16C54’s program memory as we all programmed in assembler back then. As time passed, I quickly “outgrew” the PIC16C54’s limited I/O system (12 I/O lines) and moved up to using the “bigger” PIC16C55 device...
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The Design Cycle 200802 (Complete set of ExpressPCB files)