DRA722_17 Datasheet, PDF (253/408 Pages) Texas Instruments – Infotainment Applications Processor

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DRA722, DRA724, DRA725, DRA726
SPRS956B – MARCH 2016 – REVISED JANUARY 2017
Table 7-39. Switching Characteristics Over Recommended Operating Conditions for UART (continued)
NO. PARAMETER
DESCRIPTION
3 t_w(RTS)
Pulse width, transmit start bit, 15/30/100 pF high or low
(1) U = UART baud time = 1/programmed baud rate
MIN
U - 2⁽¹⁾
MAX
U + 2⁽¹⁾
UNIT
ns
UARTi_TXD
3
2
Start
Bit
Data Bits
UARTi_RXD
5
4
Start
Bit
Data Bits
Figure 7-32. UART Timing
SPRS906_TIMING_UART_01
7.16 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 multiple chip select pins spim_cs[i], where i = 1 to 4.
NOTE
For more information, see the Serial Communication Interface section of the device TRM.
NOTE
The McSPIm module (m = 1 to 4) is also referred to as SPIm.
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Timing Requirements and Switching Characteristics 253
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