Info segment A IS locked by default, while it does not hold any valuable data anymore. (and on those devices which DO hold valuable data, it is not protected at all). Maybe two different improvements in the design have crossed here, making one of them mostly obsolete again. You can still use the InfoA segment for device-specific data that shall not be erased during a firmware update. If supported by the programmer. (I guess, TI will get some advantage for selling their own programmers by this)
The TLV table at 1xa00 is indeed an improvement as it tells not only calibration data but also lists the available modules. This could be useful for libraries which can see whether there are 2 or 4 USCI modules available etc. Since it does not provide information about the port mapping of the module signals (there's no mapping controller for the 54xx, even if it is listed in the newest family guide, where you could read this kind of info from), the use is limited, and the application software already needs to exactly know which peripherals are connected to which pin, so the TLV is pretty much useless. Except for the unique processor ID and the ADC calibration values. All I can think of is a program that automatically generates a proper master-includefile for a new processor by reading the processor type and the available modules and their positions from the TLV structure. The CAL_x values are no more needed for processors with an FLL module and an internal calibrated REFO. Therefore they dumped them. On MSPs with FLL+ module without internal REFO you'll still need them in case you don't have an external watch crystal available. IMHO, the universal clock system on the 54xx has removed all former drawbacks of previous clock module types. DCO can now reach maximum frequency, ACLK and SMCLK can be sourced form any clock, FLL is there and an itnernal reference and also a fallback source for the WDT, the VLO. JMGross ----- Ursprüngliche Nachricht ----- Von: Hans Nieuwenhuis An: mspgcc-users@lists.sourceforge.net Gesendet am: 27 Mai 2010 20:40:38 Betreff: Re: [Mspgcc-users] Linker script for msp430x54xx Hi, Thanks for the explanation about infomenobits. However I am not so sure about the the special purpose of info segment A. It can be seperately locked though. According to the user manual there is a newer method implemented in the 5xx devices which is located at 0x1a00 and further. This table is a lot more comprehensive and contain the calibrated ADC offsets. Furthermore the clock system has changed and is now accessed using UCSCTL0 - UCSCTL8. The old CAL_DCO_* and CAL_BC1_* pointers do not apply anymore. FLL is done inside the FLL now. Regards, Hans
