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S9S08QD2CSC Datasheet(PDF) 41 Page - Freescale Semiconductor, Inc |
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S9S08QD2CSC Datasheet(HTML) 41 Page - Freescale Semiconductor, Inc |
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41 / 198 page ![]() Chapter 4 Memory Map and Register Definition MC9S08QD4 Series MCU Data Sheet, Rev. 6 Freescale Semiconductor 41 Figure 4-3. Flash Burst Program Flowchart 4.5.5 Access Errors An access error occurs whenever the command execution protocol is violated. Any of the following specific actions will cause the access error flag (FACCERR) in FSTAT to be set. FACCERR must be cleared by writing a 1 to FACCERR in FSTAT before any command can be processed. • Writing to a flash address before the internal flash clock frequency has been set by writing to the FCDIV register • Writing to a flash address while FCBEF is not set (A new command cannot be started until the command buffer is empty.) 1 0 FCBEF ? START WRITE TO FLASH TO BUFFER ADDRESS AND DATA WRITE COMMAND TO FCMD NO YES FPVIO OR WRITE 1 TO FCBEF TO LAUNCH COMMAND AND CLEAR FCBEF (2) NO YES NEW BURST COMMAND ? 1 0 FCCF ? ERROR EXIT DONE (2) Wait at least four bus cycles before checking FCBEF or FCCF. 1 0 FACCERR ? CLEAR ERROR FACCERR ? WRITE TO FCDIV(1) (1) Required only once after reset. |
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