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DA14530 Datasheet(PDF) 99 Page - Renesas Technology Corp |
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DA14530 Datasheet(HTML) 99 Page - Renesas Technology Corp |
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99 / 333 page  DA14530 Low Power Bluetooth 5.1 SoC Final Datasheet Revision 3.4 21-Dec-2021 CFR0011-120-00 99 of 332 © 2021 Renesas Electronics QD_CHA_X QD_CHB_X Figure 43: Moving Forward on Axis X QD_CHA_X QD_CHB_X Figure 44: Moving Backwards on Axis X Depending on whether channel A or channel B is leading in phase, the quadrature decoding block calculates the direction on the related axis. Furthermore, the signed counter value represents the number of steps moved. Users can choose which GPIOs to use for the channels by programming the QDEC_CTRL2_REG register. The block supports two modes of operation: quadrature counting and edges counting. The quadrature counting mode reads the patterns of successive pulses as in Figure 43 and Figure 44, while the edges counting mode simply counts all positive and negative edges on any of the two channels of a pair. NOTE If two edges happen at the same time, the counter will only count one. The digital filter eliminates the spikes shorter than three clock periods. It is followed by an edge detection circuitry and they are shown in Figure 45. 16bit Counter X-Axis D Q D Q Cnt_dir Cnt_en D Q D Q Cnt_dir Cnt_en 16bit Counter Y-Axis D Q D Q D Q D Q J Q K D Q D Q D Q D Q J Q K D Q D Q D Q D Q J Q K D Q D Q D Q D Q J Q K ChA_x ChB_x ChA_y ChB_y Digital Filtering & Edge Detection Quadrature decoders QDEC_CHy_EVENT_MODE QDEC_CHx_EVENT_MODE 8bit Counter QDEC_EVENT_CNT Figure 45: Digital Filtering and Edge Detection Circuit A counter for its dedicated axis holds the movement events of the channels. When a channel is disabled, the counter is reset. The counters are accessible via the APB bus. The QDEC_EVENT_CNT gathers all edges on all channels regardless of the mode of operation. If two edges happen at the same time, this counter will only be increased by one. |
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