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TM4C129XNCZAD: How to select between the Advanced High-Performance Bus (AHB), and Advanced Peripheral Bus (APB)
Whereas with the TM4C123x parts there was the GPIOHBCTL register which could be used to select GPIO ports A to F to be individually accessible from either the AHB or APB bus (other GPIO ports on a TM4C123x could only be accessed from the AHB bus).
Just to be clear, the TM4C129 devices only connect to the AHB bus. The TM4C123 devices had two separate addresses for each port. One address for the slower APB bus for compatibility with older LM3 devices, and one for the faster AHB bus. For the TM4C129 devices there is no way to select the slower APB bus.
