Is there an internal pull-up on the UART Tx (both of them) of the 1612? I did
search the datasheet and found that only JTAG has internal pull-ups. Need to
decide if I need an external pull-up resistor for the UTXD0/UTXD1 lines.
Thanks
Internal pull-up on UART Tx?
Started by ●May 20, 2010
Reply by ●May 20, 20102010-05-20
The UART will "drive" its TXD pin "up" during a "1-bit", a "stop-bit", and no
transmission. It will "drive" its TXD pin "down" during a "0-bit", "start bit",
and "break".
There is no internal pull-up. You can add an external pull-up but I do not see a reason to do that. It is driven up and down.
--- In m..., "merapcb" wrote:
> Is there an internal pull-up on the UART Tx (both of them) of the 1612? I did search the datasheet and found that only JTAG has internal pull-ups. Need to decide if I need an external pull-up resistor for the UTXD0/UTXD1 lines.
>
> Thanks
>
There is no internal pull-up. You can add an external pull-up but I do not see a reason to do that. It is driven up and down.
--- In m..., "merapcb" wrote:
> Is there an internal pull-up on the UART Tx (both of them) of the 1612? I did search the datasheet and found that only JTAG has internal pull-ups. Need to decide if I need an external pull-up resistor for the UTXD0/UTXD1 lines.
>
> Thanks
>
