3
2
Start
Bit
Data Bits
UART_TXDn
UART_RXDn
5
Data Bits
Bit
Start
4
OMAP-L137
SPRS563G – SEPTEMBER 2008 – REVISED JUNE 2014
www.ti.com
6.24.2 UART Electrical Data/Timing
Table 6-94. Timing Requirements for UARTx Receive
(1)
(see
Figure 6-65
)
No.
PARAMETER
MIN
MAX
UNIT
4
t
w(URXDB)
Pulse duration, receive data bit (RXDn)
0.96U
1.05U
ns
5
t
w(URXSB)
Pulse duration, receive start bit
0.96U
1.05U
ns
(1)
U = UART baud time = 1/programmed baud rate.
Table 6-95. Switching Characteristics Over Recommended Operating Conditions for UARTx Transmit
(1)
(see
Figure 6-65
)
No.
PARAMETER
MIN
MAX
UNIT
1
f
(baud)
Maximum programmable baud rate
D/E
(2) (3)
MBaud
(4)
2
t
w(UTXDB)
Pulse duration, transmit data bit (TXDn)
U - 2
U + 2
ns
3
t
w(UTXSB)
Pulse duration, transmit start bit
U - 2
U + 2
ns
(1)
U = UART baud time = 1/programmed baud rate.
(2)
D = UART input clock in MHz. The UART(s) input clock source is PLL0_SYSCLK2.
(3)
E = UART divisor x UART sampling rate. The UART divisor is set through the UART divisor latch registers (DLL and DLH). The UART
sampling rate is set through the over-sampling mode select bit (OSM_SEL) of the UART mode definition register (MDR).
(4)
Baud rate is not indicative of data rate. Actual data rate will be limited by system factors such as EDMA loading, EMIF loading, system
frequency, etc.
Figure 6-65. UART Transmit/Receive Timing
180
Peripheral Information and Electrical Specifications
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