C8051F52X_12 Datasheet, PDF (116/221 Pages) Silicon Laboratories – 8/4/2 kB ISP Flash MCU Family

C8051F52x/F53x
5. Add address bounds checking to the routines that write or erase Flash memory to ensure that a routine
called with an illegal address does not result in modification of the Flash.
12.2.3. System Clock
1. If operating from an external crystal, be advised that crystal performance is susceptible to electrical
interference and is sensitive to layout and to changes in temperature. If the system is operating in an
electrically noisy environment, use the internal oscillator or use an external CMOS clock.
2. If operating from the external oscillator, switch to the internal oscillator during Flash write or erase
operations. The external oscillator can continue to run, and the CPU can switch back to the external
oscillator after the Flash operation has completed.
Additional Flash recommendations and example code can be found in application note “AN201: Writing to
Flash from Firmware," available from the Silicon Laboratories website.
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Rev. 1.4