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LPC47M14X Datasheet(PDF) 198 Page - SMSC Corporation |
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LPC47M14X Datasheet(HTML) 198 Page - SMSC Corporation |
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198 / 205 page  SMSC DS – LPC47M14X Page 198 Rev. 03/19/2001 KCLK/ MCLK KDAT/ MDAT Start Bit Bit 0 Bit 7 CLK 1 CLK 2 CLK 9 CLK 10 t1 t6 t4 t3 CLK 11 t5 Parity Bit Stop Bit t2 FIGURE 43 – KEYBOARD/MOUSE RECEIVE/SEND DATA TIMING NAME DESCRIPTION MIN TYP MAX UNITS t1 Time from DATA transition to falling edge of CLOCK (Receive) 5 25 µsec t2 Time from rising edge of CLOCK to DATA transition (Receive) 5 T4-5 µsec t3 Duration of CLOCK inactive (Receive/Send) 30 50 µsec t4 Duration of CLOCK active (Receive/Send) 30 50 µsec t5 Time to keyboard inhibit after clock 11 to ensure the keyboard does not start another transmission (Receive) >0 50 µsec t6 Time from inactive to active CLOCK transition, used to time when the auxiliary device samples DATA (Send) 5 25 µsec Data Data t1 Data MIDI_Tx Idle (No Data) Idle (No Data) Stop Bit Start Bit FIGURE 44 – MIDI DATA BYTE NAME DESCRIPTION MIN TYP MAX UNITS t1 MIDI Data Bit Time 31.7 32 32.3 µsec Note: The MIDI bit clock is 31.25kHz +/- 1% |
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