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TL16C750E: Question regarding baudrates at 3.3V

Clément Letonnelier
Expert 2426 points
Part Number: TL16C750E

Hello,

The datasheet indicates in preamble the following:

  • 6 Mbps (48-MHz oscillator input clock) at 5 V and 3.3 V
  • 3 Mbps (48-MHz oscillator input clock) at 5 V and 3.3 V
  • 2 Mbps (32-MHz oscillator input clock) at 3.3 V

In our application we have one baudrate which is at 2.083Mbps, so I had understood at first that we would need a 48MHz oscillator to be able to reach that baudrate.

However, from my computations, if I set the baud divider to 8 instead of 16 (i.e. DLF[7] = 1), it seems I am able to reach that frequency for a 20MHz oscillator by setting:

  • DLH at 0x00
  • DLL at 0x01
  • DLF at 0x8D

Do you confirm the preamble is just for information and my computation is correct ?

Regards,

Clément

  • +1
    Guru 267450 points

    The preamble does not show limits; it shows some baud rates that are possible. According to table 5, the actual limit is on the oscillator speed.

    Anyway, baud rates up to 3 Mbps and oscillator frequencies up to 48 MHz are possible, so you are allowed to generate 2 Mbps if you find a way to divide down the clock to that.