Hello @marvincabuenas,
Just for double check, are you referring to the qualifier of the Chapter 18: LPC43xx Serial GPIO (SGPIO)?
LPC43xx User Manual (UM10503). Chapter 18: LPC43xx Serial GPIO (SGPIO). Section 18.7. Functional description mentions: "The shift clock can be qualified by an external pin or other slice."
[LPC43xx ARM Cortex-M4/M0 dual-core microcontroller User Manual. Chapter 18: LPC43xx Serial GPIO (SGPIO)]
If you look to Fig 38. Basic operation of one slice, you may find that the qualifier is being used to enable or disable a multiplexor of SGPIO_CLOCK signal.
Section 18.6.2. SGPIO multiplexer configuration registers (SGPIO_MUX_CFG0 to 15) mentions how to use the register to enable, disable, use a slice or an external pin as a qualifier.
To understand where or how the qualifiers are used, might be useful to take a look to the following information:
- SGPIO inverted clock qualifier - NXP Community
- SGPIO: External clock qualifier signal use - NXP Community
- SGPIO: Interrupt on Data Qualifier pin - NXP Community
- I2C Software Implementation
- LPC4310FBD144|Arm Cortex-M4/M0|32-bit MCU | NXP Semiconductors, in Documentation search SGPIO, there are five application notes that could be helpful to see the usage of SGPIO's qualifiers.
Best regards, Raul.
