USB5734 datasheet(26/61 Pages) MICROCHIP

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USB5734

DS00001854D-page 26

 2015-2016 Microchip Technology Inc.

3.4.5.6

Configuration 6 - Full UART Mode

When the CFG_STRAP is configured to this mode, the programmable function pins (PROG_FUNC[7:1]) are set for full

UART configuration and also provide an SMBus/I2C interface. In this mode the PROG_FUNCx pins are used in con-

junction with the UART_TX and UART_RX pins for a full UART interface. Table 3-21 details the PROG_FUNC[7:1] pin

assignments in this mode.

Note:

When flow control is disabled, UART_nCTS, UART_nDCD, and UART_nDSR must not be left floating. In

this case, these pins should include external pull-downs to maintain UART communication in Full UART

Mode with no flow control.

TABLE 3-21:

CONFIGURATION 6 PROG_FUNC[7:1] FUNCTION ASSIGNMENT

Function

Buffer

Type

Description

PROG_FUNC1

UART_nRTS

I/O12

UART Request To Send

PROG_FUNC2

UART_nCTS

I/O6

UART Clear To Send

PROG_FUNC3

UART_nDCD

I/O12

UART Data Carrier Detect

PROG_FUNC4

SMDAT

OD12

SMBus/I2C Data

The SMBus/I2C interface acts as SMBus slave or I2C bridge

dependent on the device configuration. Refer to Section 3.4.1,

"SPI/SMBus/I2C/UART Configuration (I2C_SLV_CFG[1:0])".

PROG_FUNC5

SMCLK

OD12

SMBus/I2C Clock

The SMBus/I2C interface acts as SMBus slave or I2C bridge

dependent on the device configuration. Refer to Section 3.4.1,

"SPI/SMBus/I2C/UART Configuration (I2C_SLV_CFG[1:0])".

PROG_FUNC6

UART_nDTR

I/O12

UART Data Terminal Ready

PROG_FUNC7

UART_nDSR

I/O10

UART Data Set Ready

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