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TIR1000IPS Datasheet(PDF) 5 Page - Texas Instruments |
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TIR1000IPS Datasheet(HTML) 5 Page - Texas Instruments |
5 / 9 page TIR1000, TIR1000I STANDALONE IrDA ™ ENCODER AND DECODER SLLS228F – DECEMBER 1995 – REVISED JULY 1999 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION IrDA encoder function (continued) It is possible for jitter or slight frequency differences to cause the next falling edge on IR_RXD to be missed for one 16XCLK cycle. In that case, a 1-clock-wide pulse appears on U_RXD between consecutive zeroes. It is important for the UART to strobe U_RXD in the middle of the bit time to avoid latching this 1-clock-wide pulse. The TL16C550C UART already strobes incoming serial data at the proper time. Otherwise, note that data is required to be framed by a leading zero and a trailing one. The falling edge of that first zero on U_RXD synchronizes the read strobe. The strobe occurs on the eighth 16XCLK pulse after the U_RXD falling edge and once every 16 cycles thereafter until the stop bit occurs. 1 2 3 4 5 6 7 8 10 12 14 16 1 2 3 4 5 6 7 8 10 12 14 16 IR_RXD 16XCLK U_RXD Figure 6. Timing Causing 1-clock-wide Pulse Between Consecutive Ones 16 Cycles 16 Cycles 16 Cycles 7 Cycles 16XCLK IR_RXD U_RXD External Strobe Figure 7. Recommended Strobing For Decoded Data |
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