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SPRS717F –OCTOBER 2011–REVISED APRIL 2013
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5.13 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).
5.13.1 UART Electrical Data and Timing
Table 5-91. Timing Requirements for UARTx Receive
(see Figure 5-96)
NO.
MIN
MAX
UNIT
3
tw(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 5-92. Switching Characteristics for UARTx Transmit
(see Figure 5-96)
NO.
PARAMETER
Maximum programmable baud rate
Pulse width, transmit start, stop, data bit
MIN
MAX
3.6864
U + 2(1)
UNIT
MHz
ns
1
2
fbaud(baud)
tw(TX)
U - 2(1)
(1) U = UART baud time = 1/programmed baud rate.
2
2
2
Start
Bit
UARTx_TXD
Stop Bit
Data Bits
3
3
3
Start
Bit
UARTx_RXD
Stop Bit
Data Bits
Figure 5-96. UART Timings
222
Peripheral Information and Timings
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