AN-B-001 DA14580/581/583 Booting from Serial Interfaces
■The DA1458x can boot from external serial devices when the OTP memory is not programmed, to enable development of the application code. At power-up the system enters Development Mode, where the boot code decides which interface to boot from. This document describes the booting sequence for all supported serial interfaces and provides the developer with the necessary information for realizing the protocol required for establishing communication between an external device and the DA1458x.
●Introduction
■The DA1458x operates in two modes, namely the ‘Normal Mode’ and the ‘Development/Calibration Mode’ hereafter addressed as ‘DevMode’. The decision which mode the chip enters after power-up, is taken by the boot code residing in the ROM. A complete flow chart of the booting code is illustrated in the datasheet of the DA1458x.
■DevMode will be entered when the OTP header contains a value zero at the first two addresses, when read by the CPU. This implies that the OTP is not programmed and the DA1458x should switch to the DevMode, so that users get access to download code from external devices into the internal SRAM (SysRAM). However, when the OTP contains specific values (magic numbers) in these locations the DA1458x will enter Normal Mode and proceed with mirroring of the OTP contents into the SysRAM in the booting sequence, as described in the datasheet.
■To allow for maximum flexibility, a predefined number of pins are examined and utilised at boot time to communicate with external devices using the three serial interfaces available on chip: UART, SPI and I2C. SPI and I2C can be masters on the DA1458x side expecting to communicate with an external slave device and SPI can also be slave expecting to communicate with an external master.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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28-Dec-2021 |
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Revision 2.2 |
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AN-B-001 |
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841 KB |
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