AM1806_16 Datasheet, PDF (167/245 Pages) Texas Instruments – AM1806 ARM® Microprocessor

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AM1806
SPRS658F – FEBRUARY 2010 – REVISED MARCH 2014
6.18.2 UART Electrical Data/Timing
Table 6-81. Timing Requirements for UART Receive⁽¹⁾ (see Figure 6-42)
NO.
4 t_w(URXDB)
Pulse duration, receive data bit (RXDn)
5 t_w(URXSB)
Pulse duration, receive start bit
(1) U = UART baud time = 1/programmed baud rate.
1.3V, 1.2V, 1.1V, 1.0V
MIN
MAX
0.96U
1.05U
0.96U
1.05U
UNIT
ns
ns
Table 6-82. Switching Characteristics Over Recommended Operating Conditions for UARTx Transmit⁽¹⁾
(see Figure 6-42)
NO.
PARAMETER
1.3V, 1.2V, 1.1V, 1.0V
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.
For UART0, the UART input clock is SYSCLK2.
For UART1 or UART2, the UART input clock is ASYNC3 (either PLL0_SYCLK2 or PLL1_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/DDR loading,
system frequency, etc.
UART_TXDn
Start
Bit
3
2
Data Bits
5
4
UART_RXDn
Start
Bit
Data Bits
Figure 6-42. UART Transmit/Receive Timing
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Peripheral Information and Electrical Specifications 167
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