NXP Semiconductors LPC55S6 Series, Application Note

Page: 8 / 12

– Make the Secure GPIO IP Secure:
Figure 8. Make the Secure GPIO IP Secure
– Make the IOCON block Secure:
Figure 9. Make the IOCON block Secure
– Configure P0_5 pin function to Secure GPIO (FUNC=10):
Figure 10. Configure P0_5 pin function to Secure GPIO (FUNC=0xA)
– Enable Secure GPIO clock:
Figure 11. Enable Secure GPIO clock
3.3 Usage of Secure PINT
From application perspective, the method of using Secure PINT is same as of normal PINT.
There is one thing that needs extra attention:
– To disable the Non-secure world from accessing the Secure PINT register, set the Secure PINT to Secure through Secure AHB
Controller.
– Then you can use it like normal PINT and use the same APIs as normal PINT.
The code snippets for above settings are as shown below.
– Make the Secure PINT register Secure:
NXP Semiconductors
Usage
LPC55S6x Secure GPIO and Usage, Rev. 0, 15 January 2019
Application Note
8 / 12