Figure 2. Secure-state and Non-secure state view for TrustZone and Secure AHB Controller
1.2 Normal GPIO
Normal GPIO is the most common digital peripheral in a microcontroller. Normal GPIO of LPC MCU is very flexible and powerful.
Like SPI, UART and so on, a normal GPIO is also a digital peripheral in the MCU. Following is a simple block diagram of the
normal GPIO. The normal GPIO can read a pin state regardless of pin function configured. For example, if this pin is configured
as UART, then the pin state can be read via normal GPIO read.
NXP Semiconductors
Background
LPC55S6x Secure GPIO and Usage, Rev. 0, 15 January 2019
Application Note
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