AM3892 datasheet(78/299 Pages) TI

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AM3894

AM3892

SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

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3.2.17 Universal Asynchronous Receiver/Transmitter (UART) Signals

Table 3-20. UART0 Terminal Functions

SIGNAL

TYPE(1)

OTHER(2) (3)

MUXED

DESCRIPTION

NAME

NO.

PULL: IPD / IPD

UART0 Receive Data Input. Functions as IrDA

UART0_RXD

N10

DRIVE: Z / Z

receive input in IrDA modes and CIR receive input in

PINCTRL173

DVDD_3P3

CIR mode.

PULL: IPD / DIS

UART0 Transmit Data Output. Functions as transmit

UART0_TXD

DRIVE: L / H

PINCTRL174

output in CIR and IrDA modes.

DVDD_3P3

PULL: IPU / DIS

UART0 Request to Send Output. Indicates module is

UART0_RTS /

GP1

DRIVE: H / H

ready to receive data. Functions as SD output in IrDA

GP1[27]

PINCTRL175

DVDD_3P3

mode.

PULL: IPU / IPU

UART0_CTS /

GP1

UART0 Clear to Send Input. Has no function in IrDA

DRIVE: Z / Z

GP1[28]

PINCTRL176

and CIR modes.

DVDD_3P3

UART0_DTR /

PULL: IPU / DIS

GPMC_A[20]/

GPMC, GP1

DRIVE: H / H

UART0 Data Terminal Ready Output

GPMC_A[12]/

PINCTRL177

DVDD_3P3

GP1[16]

UART0_DSR /

PULL: IPU / IPU

GPMC_A[19]/

GPMC, GP1

DRIVE: Z / Z

UART0 Data Set Ready Input

GPMC_A[24]/

PINCTRL178

DVDD_3P3

GP1[17]

UART0_DCD /

PULL: IPU / IPU

GPMC_A[18]/

GPMC, GP1

DRIVE: Z / Z

UART0 Data Carrier Detect Input

GPMC_A[23]/

PINCTRL179

DVDD_3P3

GP1[18]

UART0_RIN/

PULL: IPU / IPU

GPMC_A[17]/

GPMC, GP1

DRIVE: Z / Z

UART0 Ring Indicator Input

GPMC_A[22]/

PINCTRL180

DVDD_3P3

GP1[19]

(1)

I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal.

(2)

PULL: A / B, where:

A is the state of the internal pull resistor during POR reset

B is the state of the internal pull resistor after POR and Warm reset are de-asserted and during Warm reset

IPD = Internal Pulldown Enabled, IPU = Internal Pullup Enabled, DIS = Internal Pull Disabled

DRIVE: A / B, where;

A is the driving state of the pin during POR reset

B is the driving state of the pin after POR and Warm reset are de-asserted and during Warm reset

H = Driving High, L = Driving Low, Z = 3-State

For more detailed information on pullup/pulldown resistors and situations where external pullup/pulldown resistors are required, see

Section 4.2.1, Pullup/Pulldown Resistors.

(3)

Specifies the operating I/O supply voltage for each signal.

Device Pins

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