EM357-RTR datasheet(50/241 Pages) SILABS

50 / 241 page

Rev 1.3

7. GPIO (General Purpose Input/Output)

The EM35x has 24 multipurpose GPIO pins, which may be individually configured as:



General purpose output



General purpose open-drain output



Alternate output controlled by a peripheral device



Alternate open-drain output controlled by a peripheral device



Analog



General purpose input



General purpose input with pull-up or pull-down resistor

The basic structure of a single GPIO is illustrated in GPIO Block DiagramFigure 7.1.

Figure 7.1. GPIO Block Diagram

A Schmitt trigger converts the GPIO pin voltage to a digital input value. The digital input signal is then always

routed to the GPIO_PxIN register; to the alternate inputs of associated peripheral devices; to wake detection logic

if wake detection is enabled; and, for certain pins, to interrupt generation logic. Configuring a pin in analog mode

disconnects the digital input from the pin and applies a high logic level to the input of the Schmitt trigger.

Only one device at a time can control a GPIO output. The output is controlled in normal output mode by the

GPIO_PxOUT register and in alternate output mode by a peripheral device. When in input mode or analog mode,

digital output is disabled.

GPIO_PxIN

GPIO_PxOUT

GPIO_PxSET

GPIO_PxCLR

GPIO_PxWAKE

GPIO_PxCFGH/L

Alternate output

Analog

functions

Wake detection

Alternate input

VDD_PADS

GND

VDD_PADS

GND

Output control

(push pull ,

open drain , or

disabled )

Schmitt trigger

VDD_PADS

GND

Protection

diode

Protection

diode

P-MOS

N-MOS

EM357-RTR Folha de dados(PDF) 50 Page - Silicon Laboratories

EM357-RTR Folha de dados(HTML) 50 Page - Silicon Laboratories

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Folha de dados Download

Ligação URL