2.9.1. APB slave multiplexer

The APB slave multiplexer, supports sixteen APB slaves in the IoT Subsystem. All ports are synchronous to the AHB expansion ports. Five APB ports are used for internal usage and eleven APB ports are hooked-up to the IoT Subsystem boundary and can be connected to external peripherals. The table below shows the usage of the APB ports in the IoT Subsystem:

Table 2.3. APB ports

APB portConnection
PORT0TIMER0
PORT1TIMER1
PORT2APBTARGEXP2
PORT3eFlash cache
PORT4APBTARGEXP4
PORT5APBTARGEXP5
PORT6APBTARGEXP6
PORT7APBTARGEXP7
PORT8APBTARGEXP8
PORT9eFlash controller
PORT10eFlash controller
PORT11APBTARGEXP11
PORT12APBTARGEXP12
PORT13APBTARGEXP13
PORT14APBTARGEXP14
PORT15APBTARGEXP15

If an APB expansion interface is not used to connect a peripheral, the port must be tied off properly at SoC integration level.

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