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DA14530 Datasheet(PDF) 101 Page - Renesas Technology Corp |
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DA14530 Datasheet(HTML) 101 Page - Renesas Technology Corp |
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101 / 333 page  DA14530 Low Power Bluetooth 5.1 SoC Final Datasheet Revision 3.4 21-Dec-2021 CFR0011-120-00 101 of 332 © 2021 Renesas Electronics 17 Clockless Wakeup Controller 17.1 Introduction The Clockless Wakeup Controller implements a circuit that enables the RC32K clock which in turn triggers the HW Startup FSM to allow the system to be woken up by an external event (a GPIO toggle). This controller is only used when the system is in hibernation mode, that is, when all clocks are stopped. Features ● Wake up the system from specific GPIOs (P0_1, P0_2, P0_3, P0_4, and P0_5) ● Configurable polarity of the GPIO signals (single configuration for all GPIOs) ● Special RC filtered inputs feeding the wakeup control circuit (Type B pads) ● Always powered RC32KHz P0_1 P0_2 P0_3 P0_4 P0_5 FF HIBERN_WKUP_POLARITY RC Filtered Outputs Non-Filtered Outputs => to PPA Enable Start Up FSM Fast_mode clock HIBERN_WKUP_MASK Figure 46: Clockless Wakeup Controller Circuit 17.2 Architecture The Clockless Wakeup Controller automatically enables the RC32K oscillator when a toggle is identified in one of the five specific GPIOs (P0_1, P0_2, P0_3, P0_4, and P0_5). These GPIO signals are connected to the Type B pads, which provide two outputs to the digital domain. One output goes through a Schmitt trigger and the other one goes through an RC filter with a cutoff frequency of 100 kHz and a Schmitt trigger. The output going through the RC filter and a Schmitt trigger feeds the clockless wakeup controller circuitry. Hence, any spikes larger than 100 kHz will be filtered out without waking up the system. The triggering GPIO can be defined by means of a masking register. If no GPIO is masked out, any toggle in any of these GPIOs will create an edge which serves as a clock for a Flip-Flop to lock and enable the oscillator. The polarity of the edge is also programmable, but it is common for the GPIOs and not a dedicated bit per GPIO. Note that, if two opposite edges occur exactly at the same time on two GPIOs that are allowed to wake up the system, the XOR output will not change its value and no wake up occurs. However, even if the GPIO signal events have a couple of ns difference, the circuit will still understand it and the clock will be started. |
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