73. Design PISO register for custom UART Transmitter
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UART Parallel-to-Serial Conversion: UART converts parallel data into a serial bit stream, enabling transmission over a single data line.
Dual-Mode Control: The CTR input controls 2-to-1 multiplexers, selecting between parallel loading (CTR = 0) and serial shifting (CTR = 1).
LSB-First Transmission: D0 loads into Q0 and is transmitted first, while D1–D3 shift through Q3 → Q2 → Q1 → Q0.
1 Hz Clock Synchronization: A 1 Hz clock ensures uniform bit intervals for reliable data transmission.
Register Flushing: During shifting, zeros enter through Q3, clearing the register after the 4-bit transmission completes.