C8051F521-C-IM 查看數據表（PDF） - Silicon Laboratories

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C8051F521-C-IM

8/4/2 kB ISP Flash MCU Family

Silicon Laboratories 

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.

116

Rev. 1.4

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