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5.18

Universal Asynchronous Receiver/Transmitter (UART) Timings

Start

Bit

Data Bits

UART.TX

UART.RX

Data Bits

Bit

Start

TMS320VC5502

Fixed-Point Digital Signal Processor

SPRS166H – APRIL 2001 – REVISED NOVEMBER 2004

Table 5-50 to Table 5-51 assume testing over recommended operating conditions (see Figure 5-49).

Table 5-50. UART Timing Requirements

VC5502-200

VC5502-300

NO.

UNIT

MIN

MAX

tw(UDB)R

Pulse width, receive data bit

0.96U(1)

1.05U(1)

tw(USB)R

Pulse width, receive start bit

0.96U(1)

1.05U(1)

(1)

U = UART baud time = 1/programmed baud rate

Table 5-51. UART Switching Characteristics

VC5502-200

VC5502-300

NO.

PARAMETER

UNIT

MIN

MAX

fbaud

Maximum programmable baud rate

MHz

tw(UDB)X

Pulse width, transmit data bit

U – 2(1)

U + 2(1)

tw(USB)X

Pulse width, transmit start bit

U – 2(1)

U + 2(1)

(1)

U = UART baud time = 1/programmed baud rate

Figure 5-49. UART Timings

Specifications

181

TMS320VC5502 Datasheet(PDF) 181 Page - Texas Instruments

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