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6.13.2 UART Electrical Data/Timing

Start

Bit

DataBits

UART_TXDn

UART_RXDn

DataBits

Bit

Start

TMS320DM647/TMS320DM648

Digital Media Processor

SPRS372A – MAY 2007 – REVISED JUNE 2007

Table 6-45. Timing Requirements for UARTx Receive(1) (see Figure 6-27)

-720

-900

NO.

UNIT

MIN

MAX

tw(URXDB)

Pulse duration, receive data bit (RXDn) [15/30/100 pF]

0.99U

1.05U

tw(URXSB)

Pulse duration, receive start bit [15/30/100 pF]

0.99U

1.05U

(1)

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

Table 6-46. Switching Characteristics Over Recommended Operating Conditions for UARTx Transmit(1)

(see Figure 6-27)

-720

-900

NO.

PARAMETER

UNIT

MIN

MAX

f(baud)

Maximum programmable baud rate

MHz

tw(UTXDB)

Pulse duration, transmit data bit (TXDn) [15/30/100 pF]

U - 2

U + 2

tw(UTXSB)

Pulse duration, transmit start bit [15/30/100 pF]

U - 2

U + 2

(1)

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

Figure 6-27. UART Transmit/Receive Timing

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