M30843FJFP

Manufacturer Part NumberM30843FJFP
ManufacturerRenesas Electronics Corporation.
M30843FJFP datasheets

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Download datasheet (4Mb)Embed
PrevNext
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Procedure to Enter EW Mode 0
Single-chip mode, memory expansion
mode or boot mode
Set MCD and PM1 registers
Transfer the rewrite control program in CPU
rewrite mode to a space other than the flash
memory
Jump to the rewrite control program transferred to
a space other than the flash memory. (In the
following steps, use the rewrite control program in
a space other than the flash memory)
NOTES:
1. In CPU rewrite mode, set the MCD register to be the 10-MHz CPU clock frequency or less and set the PM12
bit in the PM1 register to "1" (internal access wait).
2. To set the FMR01 bit to "1", set it to "1" in 8-bit unit immediately after setting it first to "0". Do not generate an
interrupt or a DMA transfer between setting the bit to "0" and setting it to "1". Set the FMR01 bit in a space
other than flash memory. Set the FMR01 bit while the NMI pin is held "H".
3. Exit CPU rewrite mode after executing the read array command.
4. When the FMR05 bit is set to "1", the user ROM area can be accessed.
5. To change the FMR01 bit setting from "1" to "0", enter read array mode to write to addresses 0057
unit. Write "00
" into 8 high-order bits.
16
Figure 25.6 How to Enter and Exit EW Mode 0
Page 404
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Rewrite control program
In boot mode only
Set the FMR05 bit to "1"(user ROM area accessed)
Set the FMR01 bit to "1" (CPU rewrite mode
(1)
enabled) after writing "0"
In boot mode only
Set the FMR05 bit to "0" (boot ROM area
accessed)
Jump to a desired address in the flash memory
f o
4
9
5
25. Flash Memory Version
(2)
Execute the software commands
(3)
Execute the read array command
Set the FMR01 bit to "0"
(5)
(CPU rewrite mode disabled)
(4)
in 16-bit
16

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