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Hardware Reference Manual for i.MX53 Quick Start
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5.15. Debug   UART   Serial   Port  
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The ? i.MX53 ? Applications ? Processor ? has ? 5 ? independent ? UART ? Ports ? (UART1 ? – ? UART5). ? The ? Processor ? will ?
boot ? by ? default ? using ? UART1 ? to ? output ? serial ? debugging ? information, ? specifically ? on ? pins ? CSI0_DAT10 ?
(pin ? R5) ? and ? CSI0_DAT11 ? (pinT2). ? These ? two ? pins ? are ? output ? from ? the ? NVCC_CSI ? module, ? which ? is ? pulled ?
up ? to ? 1.8V ? on ? the ? Quick ? Start ? board. ? In ? order ? to ? convert ? the ? UART ? Transmit ? and ? Receive ? signal ? to ? a ? 3.2V ?
logic ? signal, ? two ? single ‐ direction ? level ? shifters ? (U25, ? U26) ? are ? used. ? The ? level ? shifted ? signals ? are ? sent ? to ? a ?
low ? cost, ? RS232 ? transceiver, ? which ? reformats ? the ? signals ? to ? the ? correct ? voltages ? and ? drives ? the ? signals. ?
The ? resulting ? cable ? ready ? signals ? are ? then ? connected ? to ? the ? RS232 ? Debug ? connector. ? No ? RTS ? or ? CTS ?
signals ? are ? sent ? from ? the ? Processor ? to ? the ? Debug ? connector ? since ? these ? signals ? are ? commonly ? ignored ? by ?
most ? applications. ? The ? required ? terminal ? settings ? to ? receive ? debug ? information ? during ? the ? boot ? cycle ? are ?
shown ? in ? Table ? 13 : ?
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Data ? Rate ?
Data ? bits ?
Parity ?
Stop ? bits ?
Flow ? Control ?
115,200 ? Baud ?
8 ?
None ?
1 ?
None ?
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????????? Table ? 13 . ? Terminal ? Setting ? Parameters ?
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If ? the ? developer ? wishes ? to ? repurpose ? the ? Debug ? UART ? connector ? in ? software ? into ? an ? Applications ?
connector, ? the ? Quick ? Start ? board ? can ? support ? this ? using ? a ? Null ? Modem ? Adapter. ? The ? adapters ? are ? readily ?
available ? from ? most ? cable ? and ? electronics ? stores ? at ? a ? small ? cost. ?
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See ? the ? section ? on ? the ? Expansion ? Port ? to ? find ? how ? to ? access ? some ? of ? the ? other ? UART ? channels ? on ? the ?
Quick ? Start ? board. ?
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
61
PUBI – Public Use Business Information ?
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