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DA14530 Datasheet(PDF) 100 Page - Renesas Technology Corp

Part # DA14530
Description  Low Power Bluetooth 5.1 SoC
Download  333 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

DA14530 Datasheet(HTML) 100 Page - Renesas Technology Corp

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DA14530
Low Power Bluetooth 5.1 SoC
Final
Datasheet
Revision 3.4
21-Dec-2021
CFR0011-120-00
100 of 332
© 2021 Renesas Electronics
The quadrature decoder operates on the system clock. The QDEC_CLOCKDIV register defines the
number of clock cycles during which the decoding logic samples the data on the channel inputs. The
division is automatically disabled when the lp_clk is used as the system clock.
16.3 Programming
To program the quadrature decoder for actual quadrature counting or edge counting, follow the
simple sequence of steps below:
1. Configure the clock frequency by configuring the QDEC_CLOCKDIV register. The value in this
register will be dividing the sys_clk. However, if sys_clk = lp_clk, this divider is completely
bypassed.
2. Define which pin pairs represent the different channels for the X, Y, and Z axes or the GPIOs
from which the edges are counted. Configure such information at QDEC_CHX_PORT_SEL,
QDEC_CHY_PORT_SEL, and QDEC_CHZ_PORT_SEL registers.
3. Configure the interrupt threshold upon which an interrupt will be generated at
QDEC_CTRL_REG[QDEC_IRQ_THRES]. Note that the interrupt threshold is based on the value
of QDEC_EVENT_CNT_REG which keeps on counting after the interrupt is generated.
4. Define the mode of operation by configuring the respective QDEC_CHx_EVENT_MODE field in
the QDEC_CTRL2_REG.
5. Enable the clock of the block by writing at CLK_PER_REG[QUAD_ENABLE].
6. Wait for the interrupt and then read X, Y, and Z values at QDEC_XCNT_REG,
QDEC_YCNT_REG, and QDEC_ZCNT_REG (in the quadrature counting case) or the
QDEC_EVENT_CNT_REG (in the edges counting case).
7. Clear the interrupt (by writing at QDEC_CTRL_REG[QDEC_IRQ_STATUS]) and the edge
counter (by writing at QDEC_CTRL_REG[QDEC_EVENT_CNT_CLR) if needed.


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