SABRE-LL-I datasheet(101/141 Pages) STMICROELECTRONICS

101 / 141 page

SABRE-LL-I

GPIO pins

101/141

22.4

GPIO[2]

The GPIO[2] truth table is (for the abbreviation list please refer to Table 68):

Table 73.

GPIO[2] truth

AUX2Enable

AUX2System

GPIO[1] SPI BITS

Function

Note

GpioOut

Enable [1]

Mode[2]

Mode[1]

Mode[0]

AUX2 FB

(1)

AUX2Enable or AUX2System bit =1 represent the case in which AUX1 is used as a System or Not System

regulator.

HiZ (SPI_IN)

Comp1 IN -

(2)

In all configurations in which GPIO[2] is enabled as output:

a) the GPIO[2] pin can be always used as an analog input to the ADC system (ADC function) by writing

its address in the A2DChannelX[4:0] in the A2DConfigX register and starting a conversion;

b) the GPIO[2] pin can be always used as a digital input so its value can be always read through SPI

interface (SPI_IN function);

please note that GPIO[2] output is directly connected to ExtPWM3 input for Bridge 3 or 4 and therefore

particular care must be taken in order to avoid wrong PWM signals when ExtPWM3 is selected for

bridge 3 or 4;

d) the GPIO[2] pin is an open drain output.

100

SPI OUT

(2)

100

AuxPwm2

(2)

101

AuxPwm3

(2)

InterruptCtrl

(2)

110

SPI OUT inverted

(2)

110

AuxPwm2 inverted

(2)

111

AuxPwm3 inverted

(2)

111

IntCtrlinverted

(2)

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