UCD3138128APFC datasheet(48/83 Pages) TI1

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UCD3138128A

SLUSC99 – JULY 2016

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9.3.13 Brownout

Brownout function is used to determine if the device supply voltage is lower than a threshold voltage, a condition

that may be considered unsafe for proper operation of the device.

The brownout threshold is higher than the reset threshold voltage; therefore, when the supply voltage is lower

than brownout threshold, it still does not necessarily trigger a device reset.

The brownout interrupt flag can be polled or alternatively can trigger an interrupt to service such case by an

interrupt service routine. Please see the Power On Reset (POR) / Brown Out Reset (BOR) section.

9.3.14 Global I/O

Up to 32 pins in UCD3138xA can be configured in the Global I/O register to serve as a general purpose input or

output pins (GPIO). This includes all digital input or output pins except for the RESET pin.

The pins that cannot be configured as GPIO pins are the supply pins, ground pins, ADC-12 analog input pins,

EADC analog input pins and the RESET pin. Additional digital pins not listed in this register can be configured

through their local configuration registers.

There are two ways to configure and use the digital pins as GPIO pins:

1. Through the centralized Global I/O control registers.

2. Through the distributed control registers in the specific peripheral that shares it pins with the standard GPIO

functionality.

The Global I/O registers offer full control of:

1. Configuring each pin as a GPIO.

2. Setting each pin as input or output.

3. Reading the pin’s logic state, if it is configured as an input pin.

4. Setting the logic state of the pin, if it is configured as an output pin.

5. Connecting pin/pins to high rail through internal push/pull drivers or external pull up resistors.

The Global I/O registers include Global I/O EN register, Global I/O OE Register, Global I/O Open Drain Control

Table 6 shows the format of Global I/O EN Register (GLBIOEN) as an example:

Table 6. Global I/O EN Register (GLBIOEN)

BIT NUMBER

31:0

Bit Name

GLOBAL_IO_EN

Access

R/W

Default

0000_0000_0000_0000_0000_0000_0000_0000

Bits 31-0: GLOBAL_IO_EN – This register enables the global control of digital I/O pins

0 = Control of IO is done by the functional block assigned to the IO (Default)

1 = Control of IO is done by Global IO registers.

BIT

PIN_NAME

PIN NUMBER

UCD3138xA

PWM2

PWM3

FAULT3

ADC_EXT_TRIG

TCK

TDO

TMS

TDI

SCI_TX1

SCI_TX0

UCD3138128APFC Datasheet(PDF) 48 Page - Texas Instruments

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