TMS320DM355 datasheet(129/153 Pages) TI

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5.11

Universal Asynchronous Receiver/Transmitter (UART)

5.11.1 UART Electrical Data/Timing

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463 – SEPTEMBER 2007

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)

Table 5-26. Timing Requirements for UARTx Receive (see Figure 5-35)

DM355

NO.

UNIT

MIN

MAX

tw(URXDB)

Pulse duration, receive data bit (RXDn)

0.99U(1)

1.05U(1)

tw(URXSB)

Pulse duration, receive start bit

0.99U(1)

1.05U(1)

(1)

U = UART baud time = 1/programmed baud rate.

Table 5-27. Switching Characteristics Over Recommended Operating Conditions for UARTx Transmit

(see Figure 5-35)

DM355

NO.

PARAMETER

UNIT

MIN

MAX

UART0/1 Maximum programmable baud rate

1.5

f(baud)

MHz

UART2 Maximum programmable baud rate

tw(UTXDB)

Pulse duration, transmit data bit (TXDn)

U - 2(1)

U + 2(1)

tw(UTXSB)

Pulse duration, transmit start bit

U - 2(1)

U + 2(1)

(1)

U = UART baud time = 1/programmed baud rate.

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