AM3874 datasheet(346/361 Pages) TI

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Start

Bit

Data Bits

UARTx_TXD

Data Bits

Bit

Start

UARTx_RXD

AM3874, AM3871

SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

www.ti.com

8.21.2 UART Electrical/Data Timing

Table 8-109. Timing Requirements for UART

(see Figure 8-95)

OPP100/120/166

NO.

UNIT

MIN

MAX

tw(RX)

Pulse width, receive data bit, 15/30/100pF high or low

0.96U(1)

1.05U(1)

tw(CTS)

Pulse width, receive start bit, 15/30/100pF high or low

0.96U(1)

1.05U(1)

td(RTS-TX)

Delay time, transmit start bit to transmit data

P(2)

td(CTS-TX)

Delay time, receive start bit to transmit data

P(2)

(1)

U = UART baud time = 1/programmed baud rate

(2)

P = Clock period of the reference clock (FCLK, usually 48 MHz).

Table 8-110. Switching Characteristics Over Recommended Operating Conditions for UART

(see Figure 8-95)

OPP100/120/166

NO.

PARAMETER

UNIT

MIN

MAX

15 pF

(UART0/1/2)

15 pF

f(baud)

Maximum programmable baud rate

MHz

(UART3/4/5)

30 pF

0.23

100 pF

0.115

tw(TX)

Pulse width, transmit data bit, 15/30/100 pF high or low

U - 2(1)

U + 2(1)

tw(RTS)

Pulse width, transmit start bit, 15/30/100 pF high or low

U - 2(1)

U + 2(1)

(1)

U = UART baud time = 1/programmed baud rate

Figure 8-95. UART Timing

346

Peripheral Information and Timings

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