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Aditya Prayoga 2020-03-16 13:11:03 +07:00
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docs/helios64/gpio.md
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## User Accessible GPIOs (P5)
Helios64 provides 22 GPIOs on header P5 which can be used for user application.
Those GPIOs are provided via an 16-bit IO Expander [PCA9655E](http://www.onsemi.com/PowerSolutions/product.do?id=PCA9655E) connected to I2C bus 0.
Those GPIOs are provided via an 16-bit IO Expander [PCA9655E](http://www.onsemi.com/PowerSolutions/product.do?id=PCA9655E) connected to I2C bus 2.
Unlike Helios4 whereas some pin of IO expander is used for system usage, on Helios64 all 16 GPIOs can be used for user application.
![P5 Pinout](/helios64/img/hardware/gpio.jpg)
### Pinout Table
## Pinout Table
| PIN | Port | Remarks |
|-----|------|-------------|