Document USTX in USS/UxS not working as expected #7265
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Documentation that bit USTX in UART status register USS(u) / U0S / U1S is not mirroring TX level as expected but always reads 0, see issue esp8266#7256
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Documentation that bit USTX in UART status register USS(u) / U0S / U1S is not mirroring TX level as expected but always reads 0, see issue #7256