TMS320DM355 Datasheet, PDF (129/153 Pages) Texas Instruments – Digital Media System-on-Chip (DMSoC)

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TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463 – SEPTEMBER 2007
5.11 Universal Asynchronous Receiver/Transmitter (UART)
The contains 3 separate UART modules (1 with hardware flow control). These modules performs
serial-to-parallel conversion on data received from a peripheral device or modem, and parallel-to-serial
conversion on data received from the CPU. Each UART also includes a programmable baud rate
generator capable of dividing the 24MHz reference clock by divisors from 1 to 65,535 to produce a 16 x
clock driving the internal logic. The UART modules support the following features:
• Frequency pre-scale values from 1 to 65,535 to generate appropriate baud rates
• 16-byte storage space for both the transmitter and receiver FIFOs
• Unique interrupts, one for each UART
• Unique EDMA events, both received and transmitted data for each UART
• 1, 4, 8, or 14 byte selectable receiver FIFO trigger level for autoflow control and DMA
• Programmable auto-rts and auto-cts for autoflow control (supported on UART2)
• Programmable serial data formats
– 5, 6, 7, or 8-bit characters
– Even, odd, or no parity bit generation and detection
– 1, 1.5, or 2 stop bit generation
• False start bit detection
• Line break generation and detection
• Internal diagnostic capabilities
– Loopback controls for communications link fault isolation
– Break, parity, overrun, and framing error simulation
• Modem control functions: CTS, RTS (supported on UART2)
5.11.1 UART Electrical Data/Timing
Table 5-26. Timing Requirements for UARTx Receive (see Figure 5-35)
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.
DM355
MIN
0.99U ⁽¹⁾
0.99U ⁽¹⁾
MAX
1.05U ⁽¹⁾
1.05U ⁽¹⁾
UNIT
ns
ns
Table 5-27. Switching Characteristics Over Recommended Operating Conditions for UARTx Transmit
(see Figure 5-35)
NO.
PARAMETER
1
f_(baud)
UART0/1 Maximum programmable baud rate
UART2 Maximum programmable baud rate
2
t_w(UTXDB)
3
t_w(UTXSB)
Pulse duration, transmit data bit (TXDn)
Pulse duration, transmit start bit
(1) U = UART baud time = 1/programmed baud rate.
DM355
MIN
MAX
1.5
U - 2⁽¹⁾
U - 2⁽¹⁾
5
U + 2⁽¹⁾
U + 2⁽¹⁾
UNIT
MHz
ns
ns
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Peripheral Information and Electrical Specifications 129