DRA790 Datasheet, PDF (222/436 Pages) Texas Instruments – Infotainment Applications Processor

DRA790, DRA791
DRA793, DRA797
SPRS968A – AUGUST 2016 – REVISED FEBRUARY 2017
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1-WIRE
t
LOW1
t
LOW0
t_SLOT_and_t_REC
SPRS906_TIMING_HDQ1W_07
Figure 5-43. 1-Wire—Write Bit-One Timing (Command / Address or Data)
5.9.6.12 UART
The UART performs serial-to-parallel conversions on data received from a peripheral device and parallel-
to-serial conversion on data received from the CPU. There are 10 UART modules in the device. Only one
UART supports IrDA features. Each UART can be used for configuration and data exchange with a
number of external peripheral devices or interprocessor communication between devices
The UARTi (where i = 1 to 10) include the following features:
• 16C750 compatibility
• 64-byte FIFO buffer for receiver and 64-byte FIFO for transmitter
• Baud generation based on programmable divisors N (where N = 1…16 384) operating from a fixed
functional clock of 48 MHz or 192 MHz
• Break character detection and generation
• Configurable data format:
– Data bit: 5, 6, 7, or 8 bits
– Parity bit: Even, odd, none
– Stop-bit: 1, 1.5, 2 bit(s)
• Flow control: Hardware (RTS/CTS) or software (XON/XOFF)
• Only UART1 module has extended modem control signals (CD, RI, DTR, DSR)
• Only UART3 supports IrDA
NOTE
For more information, see the UART section of the Device TRM.
Table 5-59, Table 5-60 and Figure 5-44 assume testing over the recommended operating conditions and
electrical characteristic conditions below.
Table 5-59. Timing Requirements for UART
NO.
PARAMETER
DESCRIPTION
4 t_w(RX)
5 t_w(CTS)
t_d(RTS-TX)
t_d(CTS-TX)
Pulse width, receive data bit, 15/30/100pF high or low
Pulse width, receive start bit, 15/30/100pF high or low
Delay time, transmit start bit to transmit data
Delay time, receive start bit to transmit data
(1) U = UART baud time = 1/programmed baud rate
(2) P = Clock period of the reference clock (FCLK, usually 48 MHz or 192MHz).
MIN
0.96U⁽¹⁾
0.96U⁽¹⁾
P⁽²⁾
P⁽²⁾
MAX
1.05U⁽¹⁾
1.05U⁽¹⁾
UNIT
ns
ns
ns
ns
Table 5-60. Switching Characteristics Over Recommended Operating Conditions for UART
NO. PARAMETER
f_(baud)
2 t_w(TX)
DESCRIPTION
15 pF
Maximum programmable baud rate
30 pF
100 pF
Pulse width, transmit data bit, 15/30/100 pF high or low
MIN
U - 2⁽¹⁾
MAX
12
0.23
0.115
U + 2⁽¹⁾
UNIT
MHz
ns
222 Specifications
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