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The special function register (SFR) memory map of the C8051T62x and C8051T32x is very similar to the SFR memory map of the C8051F34A. However, there are a few differences related to functionality and features found only on certain devices. Fortunately, SFRs that exist in one family but not another can be safely written and read on the other devices without causing a problem. Likewise, certain registers have additional bits defined that are not present on all devices. In these cases, the default bit settings are safe to write, and the read values of those bits are defined in the data sheet. The example shown here is the P3 register. It is only found in the flash version and not in any of the others. In typical OTP development this register would not even be used; however if porting from an existing design that used the P3 register, no adverse affects would be seen by writing to that SFR location.
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