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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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AS3525 Datasheet(PDF) 22 Page - ams AG |
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AS3525 Datasheet(HTML) 22 Page - ams AG |
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22 / 194 page  AS3525-A/-B C22O22 Data Sheet, Confidential © 2005-2009, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.13 22 - 194 7.1.6 Boot Concept It can be selected if the system should boot either using the internal ROM (internal boot loader) or an external ROM/Flash (connected to the MPMC interface). XPC[0] is read within global chip reset to do the selection of either internal or external boot. Table 11 Boot definitions for internal/external boot selection XPC[0] Booting Option 1 Internal ROM 0 External ROM/Flash 7.1.6.1 Internal Bootloader Version C22 Within the internal ROM boot loader several options for booting can be selected: • SSP IF - SPI master for ST serial flash types • SSP IF - SPI slave • NandFlash • Debug UART diagnostics • IDE boot: direct boot from harddisk • USB boot promer. In the case that a USB connection is present and either an update button is pressed or there is no bootable device, the USB promer is started (see Figure 7 Boot decision between normal boot and USB boot promer” for details). The USB boot promer allows update of the firmware by using an USB mass storage class device. This update can be used either for initial programming (factory programming) or as mechanism for an in-field firmware update. All boot loader options of the internal bootloader are configured by XPC[3:1] pins. External pull-up or pull-down resistors should be used to configure the boot options. Table 12 Boot definitions Chip version C22 XPC[3:1] Boot Device 0 000 SPI master ST M25Pxx serial Nor Flash 1 001 SPI master Atmel AT45DB011B serial Nor Flash 2 010 SPI slave 3 011 NandFlash 4 100 IDE 5 101 reserved for developers mode 6 110 UART / Command Line Interface without diagnostics 7 111 UART / Command Line Interface with diagnostics The update button is located between xpa[4] and xpa[0]. Within the key scan routine, xpa[4] is driven shortly to each logic level “0” and “1” and the value of xpa[0] is read back to sense a keypress of the update button. For the USB promer, it is necessary that frequency settings defining the quarz crystal frequency are defined by the pins xpa[6:4]. For details refer to “Table 13 USB promer frequency settings”. These settings are read at the beginning in the initialisation routine of the bootloader. Table 13 USB promer frequency settings XPA[6:4] USB promer frequency settings 000 24 MHz 001 20 MHz 010 13 MHz 011 12 MHz 100 10 MHz others reserved / defaults to 24 MHz |
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