AM6548BACDXEAF datasheet(244/282 Pages) TI

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7.9.5.23 UART

For more details about features and additional description information on the device Universal Asynchronous

Receiver Transmitter, see the corresponding sections within Section 6.3, Signal Descriptions and Section 8,

Detailed Description.

Section 7.9.5.23.1, Section 7.9.5.23.2, and Figure 7-123 present Timing Requirements and Switching

Characteristics for UART interface.

7.9.5.23.1 Timing Requirements for UART

NO.

PARAMETER

DESCRIPTION

MIN

MAX

UNIT

tw(RX)

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

0.95U

(1)

1.05U

(1)

tw(CTS)

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

0.95U

(1)

1.05U

(1)

td(RTS-TX)

Delay time, transmit start bit to transmit data

(2)

td(CTS-TX)

Delay time, receive start bit to transmit data

(2)

(1)

U = UART baud time = 1/Programmed baud rate

(2)

P = Clock period of the reference clock (FCLK, usually 48 MHz or 192 MHz)

7.9.5.23.2 Switching Characteristics Over Recommended Operating Conditions for UART

NO.

PARAMETER

DESCRIPTION

MODE

MIN

MAX

UNIT

f(baud)

Maximum programmable baud rate

15 pF

MHz

30 pF

0.115

tw(TX)

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

U - 2

(1)

U + 2

(1)

tw(RTS)

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

U - 2

(1)

U + 2

(1)

U = UART baud time = 1/Programmed baud rate

Start

Bit

Data Bits

UART _TXD

Data Bits

Bit

Start

UART _RXD

Figure 7-123. UART Timing

For more information, see section Universal Asynchronous Receiver/Transmitter (UART) in the device TRM.

7.9.5.24 USB

The USB 2.0 subsystem is compliant with the Universal Serial Bus (USB) Specification, revision 2.0. Refer to the

specification for timing details.

The USB 3.1 GEN1 Dual-Role Device Subsystem is compliant with the Universal Serial Bus (USB) 3.1

Specification, revision 1.0. Refer to the specification for timing details.

For more details about features and additional description information on the device Universal Serial Bus

Subsystem (USB), see the corresponding sections within Section 6.3, Signal Descriptions and Section 8,

Detailed Description.

For more information, see the Universal Serial Bus (USB) Subsystem section in the device TRM.

AM6548, AM6528, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

www.ti.com

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