Texas Instruments TMS320DM355 warranty Universal Asynchronous Receiver/Transmitter Uart

TMS320DM355

Digital Media System-on-Chip (DMSoC)

www.ti.com

SPRS463A –SEPTEMBER 2007 –REVISED SEPTEMBER 2007

5.11Universal 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)

5.11.1UART Electrical Data/Timing

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

NO.				DM355		UNIT
				MIN	MAX
4	t	w(URXDB)	Pulse duration, receive data bit (RXDn)	0.99U(1)	1.05U(1)	ns
5	t	w(URXSB)	Pulse duration, receive start bit	0.99U(1)	1.05U(1)	ns

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

PRODUCT PREVIEW

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

(see Figure 5-35)

NO.		PARAMETER	DM355		UNIT
			MIN	MAX
1	f(baud)	UART0/1 Maximum programmable baud rate		1.5	MHz
		UART2 Maximum programmable baud rate		5
2	t	Pulse duration, transmit data bit (TXDn)	U - 2(1)	U + 2(1)	ns
	w(UTXDB)
3	t	Pulse duration, transmit start bit	U - 2(1)	U + 2(1)	ns
	w(UTXSB)

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

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