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DA14530 Datasheet(PDF) 52 Page - Renesas Technology Corp |
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DA14530 Datasheet(HTML) 52 Page - Renesas Technology Corp |
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52 / 333 page  DA14530 Low Power Bluetooth 5.1 SoC Final Datasheet Revision 3.4 21-Dec-2021 CFR0011-120-00 52 of 332 © 2021 Renesas Electronics ● GPIO Pin: a GPIO can be selected by the user application to act as a POR source The time needed for a GPIO pin selected for the POR to be active is stored in the POR_TIMER_REG. The register field POR_TIME is a 7-bit field which holds the time factor by which the total time for POR is calculated. The maximum value of the field is 0x7F. The total time for POR is calculated by the following formula: Totaltime=POR_TIME× 4096× RC32kclockperiod (1) where RC32k clock period = 31.25 µs at 25°C. The maximum time for which a POR can be performed is ~16.2 seconds at 25°C. The RC32k clock frequency depends on temperature, so based on the temperature span of -10°C to 50°C, the clock frequency range is calculated to be 25 kHz to 39 kHz. Then, TPORcold = 13 s TPORhot = 20.8 s 5.2.2.1 POR Timer Clock The POR timer is clocked by the RC32k clock. If a SW application disables the RC32k, the HW takes care of enabling the RC32k clock when a POR source (the RST pad or a selected GPIO pin) is asserted. It should be noted that if the POR is generated from the RST pad, the RC32k will operate with the reset (default) trimming value. If a GPIO pin is used as the POR source, the RC32k clock will be trimmed. The timing difference between both cases is expected to be minor. 5.2.2.2 RST Pad The RST pad will produce a HW reset if the pin active time is less than the programmed value in the POR_TIMER_REG register or a POR if the pin active time is greater than or equal to that value. Reset pad is always Active High. 5.2.2.3 POR from GPIO When a GPIO is used as a POR source, the selected pin retains its capability to act as GPIO. The POR_PIN_REG[PIN_SELECT] field holds the required GPIO pin number. If the value of the PIN_SELECT field equals to 0, the POR triggered by GPIO functionality is disabled. The polarity of the pin can be configured by the POR_PIN_REG [POR_POLARITY] bit, where 0 means Active Low and 1 means Active High. 5.2.3 POR Timing Diagram The operation of the POR triggered by both the RST pad and a selected GPIO pin is depicted in Figure 13. RC32k Reset pad GPIO(POR) HW Reset POR Timer counting 0 0 0 TCLK= 31.25usec <POR Timer counting 0 <POR Timer >=POR Timer counting POReset 0 >=POR Timer counting Timer value matched Timer value matched Figure 13: POR Timing Diagram |
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