Fujitsu FR81S User Manual
CHAPTER 46: WORKFLASH MEMORY
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : WORKFLASH MEMORY
FUJITSU SEMICONDUCTOR CONFIDENTIAL
40
5.10. Notes on Using Flash Memory
Notes on using the flash memory are shown below.
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If this device is reset during a write, the data that was written cannot be guaranteed.
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If CPU programming mode is set (FWE=1) using the FWE bit of the WorkFlash control register
(DFCTLR), do not perform the program in flash memory. The program runs out of control without
fetching the correct values.
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If CPU programming mode is set (FWE=1) using the FWE bit of the WorkFlash control register
(DFCTLR) and the interrupt vector table is in flash memory, do not generate interrupt requests. The
program runs out of control without fetching the correct values.
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Because this model has the ECC bit added, data always needs to be written as 32-bit by two 16-bit writes.
See "5.2 Writing Flash Memory" for procedure.
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Concurrent commands (parallel) to multiple macros must not be issued. After checking the completion of
command by the hardware sequence flag or DFRDY bit, command for the next macro must be input.
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If authentication by password of on-chip debugger (OCD) completes, you can read the content of flash
memory from external by using OCD even if security is ON. When you want to stop reading by an
outsider, password for on-chip debugger (OCD) activation approval must be configured.
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Changing to the state of the standby is a prohibition during FLASH program/erase.
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Because of the build-in ECC in this flash memory, the data superscription to the address where some
values have already been written cannot be done.
MB91520 Series
MN705-00010-1v0-E
2011