SABRE-LL-I datasheet(121/141 Pages) STMICROELECTRONICS

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SABRE-LL-I

GPIO pins

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22.14

GPIO[12]

The GPIO[12] truth table is (for the abbreviation list please refer to Table 68):

Table 93.

GPIO[12] truth

AUX2enable

AUX2syste

m (1)

AUX2Enable or AUX2System bit =1 represent the case in which AUX2 is used as a regulator (system or

not system).

Op2En

PlusPin

GPIO[12] SPI BITS

Function

Note

GpioOut

enable[12]

Mode[2]

Mode[1]

Mode[0]

RegLoop2

OpAmp2 in+

(2)

When Op2EnPlusPin = ‘1’ the GpioOutEnable[11] bit is forced to 0.

HiZ (SPI_IN)

SPI OUT

(3)

In all configurations in which GPIO[12] is enabled as output:

a) the GPIO[12] 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[12] 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[12] output is directly connected to StepCmd input for stepper driver and

therefore particular care must be taken in order to avoid wrong PWM signals when StepCmd is

selected for stepper driver (STEP_REQUEST function)

d) the GPIO[12] pin is a rail to rail, back to back output supplied by VGPIO_SPI.

Interrupt Ctrl

(3)

Comp2OUT

(3)

RegLoop2

(3)

Interrupt Ctrl inverted

(3)

Comp2OUT inverted

(3)

RegLoop2 inverted

(3)

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