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UPSD3422 Datasheet(PDF) 110 Page - STMicroelectronics |
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UPSD3422 Datasheet(HTML) 110 Page - STMicroelectronics |
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110 / 293 page  Serial UART interfaces uPSD34xx 110/293 Figure 37. UART Mode 3, Block Diagram Figure 38. UART Mode 3, Timing Diagram AI06846 Zero Detector Internal Bus Tx Control Rx Control Internal Bus SBUF Write to SBUF Read SBUF Load SBUF SBUF Input Shift Register Shift Serial Port Interrupt Rx Clock Start Tx Clock Start Shift Shift Send Load SBUF TI RI CL DS Q 1FFh TxD Pin Data Rx Detector RxD Pin 1-to-0 Transition Detector ÷16 Sample ÷16 ÷2 TB8 Timer1 Overflow Timer2 Overflow 0 01 1 01 TCLK RCLK SMOD AI06847 Write to SBUF Data Shift TxD TI Rx Clock RxD Bit Detector Sample Times Shift RI Receive Transmit D0 D1 D2 D3 D4 D5 D6 D7 Send Tx Clock Start Bit Stop Bit TB8 D0 D1 D2 D3 D4 D5 D6 D7 Start Bit Stop Bit RB8 Stop Bit Generator |
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