AM5728 datasheet(272/415 Pages) TI

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Start

Bit

Data Bits

UARTi_TXD

Data Bits

Bit

Start

UARTi_RXD

AM5728, AM5726

SPRS915O – MARCH 2014 – REVISED OCTOBER 2015

www.ti.com

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

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

Table 7-41. Switching Characteristics Over Recommended Operating Conditions for UART

NO.

PARAMETER

DESCRIPTION

MIN

MAX

UNIT

15 pF

f(baud)

Maximum programmable baud rate

30 pF

0.23

MHz

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 7-32. UART Timing

7.15 Multichannel Serial Peripheral Interface (MCSPI)

The MCSPI is a master/slave synchronous serial bus. There are four separate MCSPI modules (SPI1,

SPI2, SPI3, and SPI4) in the device. All these four modules support up to four external devices (four chip

selects) and are able to work as both master and slave.

The MCSPI modules include the following main features:

•

Serial clock with programmable frequency, polarity, and phase for each channel

•

Wide selection of SPI word lengths, ranging from 4 to 32 bits

•

Up to four master channels, or single channel in slave mode

•

Master multichannel mode:

–

Full duplex/half duplex

–

Transmit-only/receive-only/transmit-and-receive modes

–

Flexible input/output (I/O) port controls per channel

–

Programmable clock granularity

–

SPI configuration per channel. This means, clock definition, polarity enabling and word width

•

Power management through wake-up capabilities

•

Programmable timing control between chip select and external clock generation

•

Built-in FIFO available for a single channel.

•

Each SPI module supports multiply chip select pins spim_cs[i], whete i = 1 to 4.

NOTE

For more information, see the Serial Communication Interface section of the device TRM.

272

Timing Requirements and Switching Characteristics

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