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DA14530 Datasheet(PDF) 68 Page - Renesas Technology Corp |
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DA14530 Datasheet(HTML) 68 Page - Renesas Technology Corp |
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68 / 333 page  DA14530 Low Power Bluetooth 5.1 SoC Final Datasheet Revision 3.4 21-Dec-2021 CFR0011-120-00 68 of 332 © 2021 Renesas Electronics XTALRDY_CNT (8 bits) On FREQ_TRIM_SW2 rising edge, XTAL_RDY_CNT value is stored here! LP_CLK XTAL_RDY_CNT current value 2 1 0 XTAL32MHz XTAL32M_EN XTAL32_CLK_CNT (10 bits) Counting ... 0x11FF XTAL32RDY_IRQn 0 XTALRDY_STAT_REG (8 bits) XTAL_RDY_CNT old value XTAL32RDY_IRQn is always asserted when XTALRDY_CNT reaches 1 Loads from XTALRDY_CTRL_REG and counting down... XTAL32M_TRIM_READY TRIM VALUE XTAL_TRIM_SELECT=0 TRIM VALUE XTAL_TRIM_SELECT=1 XTAL32M_START_REG XTAL32M_START_REG CLK_FREQ_TRIM_REG CLK_FREQ_TRIM_REG XTAL32M_TRIM_READY asserted when current drops XTAL32_CLK_CNT= XTAL_COUNT_N XTAL32_CLK_CNT= XTAL_SETTLE_N XTAL32_SETTLE_READY Performed only during power up Figure 20: Automated Mechanism for XTAL32M Trim and Settling In both modes mentioned above, trimming is done by HW. In the current mode, upon assertion of XTAL32M_TRIM_READY, the interrupt counter value is stored in a shadow register XTALRDY_STAT_REG to enable SW understanding when the start-up section is finished. The settling section usually takes no more than five to 10 clock cycles. Using the explanation above, fine tuning and reducing the XTAL32M latency is feasible. One feature of the XTAL32_CLK_CNT is that it asserts an observable signal (SYS_STAT_REG[XTAL32_SETTLE_READY]) as soon as the counter reaches a pre-defined threshold programmed at TRIM_CTRL_REG[XTAL_SETTLE_N]. This allows the SW to have an indication of the status of the clock by adjusting the threshold accordingly. 10.3 RC Oscillators There are three RC oscillators in the DA14530: ● One providing 32 MHz (RC32M) ● One providing 32 kHz and 512 kHz (RC32K/512K) ● One providing a frequency of 15 kHz (RCX) The RC32M is powered by VBAT_LOW which is available during Active or Sleep mode. The output clock is slower than 32 MHz if untrimmed and it is used to clock the CPU and the digital part of the chip during power-up or wake-up, while the XTAL32M oscillator is settling. The simple RC oscillator (RC32K/512K) operates on VDD and provides 32 kHz or 512 kHz. The main usage of the RC32K/512K oscillator is for internal clocking during power-up or start-up. It clocks the HW FSM which brings up the power management system of the chip. In the power-up or start-up sequence, the clock dynamically changes from 32 kHz to 512 kHz in order to speed up the sequence. The enhanced RC oscillator (RCX) provides a stable 15 kHz frequency and operates on VBAT_LOW which is available during Active or Sleep mode. |
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