Datasheet

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2
2
Start
Bit
Data Bits
UARTx_TXD
3
Data Bits
Bit
Start
3
UARTx_RXD
2
3
Stop Bit
Stop Bit
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www.ti.com SPRS717E –OCTOBER 2011–REVISED JANUARY 2013
5.11 Universal Asynchronous Receiver Transmitter (UART)
For more information, see the Universal Asynchronous Receiver Transmitter (UART) section of the
AM335x ARM Cortex-A8 Microprocessors (MPUs) Technical Reference Manual (literature number
SPRUH73).
5.11.1 UART Electrical Data and Timing
Table 5-87. Timing Requirements for UARTx Receive
(see Figure 5-94)
NO. MIN MAX UNIT
3 t
w(RX)
Pulse width, receive start, stop, data bit 0.96U
(1)
1.05U
(1)
ns
(1) U = UART baud time = 1/programmed baud rate.
Table 5-88. Switching Characteristics Over Recommended Operating Conditions for UARTx Transmit
(see Figure 5-94)
NO. PARAMETER MIN MAX UNIT
1 f
baud(baud)
Maximum programmable baud rate 3.6864 MHz
2 t
w(TX)
Pulse width, transmit start, stop, data bit U - 2
(1)
U + 2
(1)
ns
(1) U = UART baud time = 1/programmed baud rate.
Figure 5-94. UART Timings
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