m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 422

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

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Figure 25.5 How to Enter and Exit CPU Rewrite Mode
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25.3.4 How to Enter and Exit CPU Rewrite Mode
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Figure 25.5 shows how to enter and exit CPU rewrite mode.
No program in the flash memory can be executed in CPU rewrite mode. Execute rewrite control program
in a space other than the flash memory (internal RAM, etc.) after transferring the program to that space.
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NOTES:
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1. Set the MCD register to the following CPU clock frequency:
2. Exit CPU rewrite mode after excuting the read array command or resetting the flash memory.
3. When CPU rewrite mode is exited while the FMR05 bit is set to "1", the user ROM area can be accessed.
M
0
Jump to the rewrite control program
transferred to space other than the flash
memory. (On the following steps, use the
rewrite control program in space other than
the flash memory.)
0
When the PM12 bit in the PM1 register is set to "0" (no internal access wait), 6.25 MHz or less
When the PM12 bit in the PM1 register is set to "1" (internal access wait), 12.5 MHz or less
3
6
Transfer the rewrite control program in
CPU rewrite mode to space other than
the flash memory
2
Set the PM0, PM1 and MCD register
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Single-chip mode,
Memory expansion mode,
Boot mode
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3
8
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8
(1)
Rewrite control program
Set the FMR01 bit to "0" (CPU rewrite mode
disabled)
In boot mode only
In boot mode only
Set the FMR03 bit to "0" after executing a
read array command or after setting the
FMR03 bit to "1"
Set the FMR05 bit to "1" (User ROM area
accessed)
Set the FMR05 bit to "0" (boot ROM area
accessed)
Set the FMR01 bit to "1" (CPU rewrite
mode enabled) following "0"
Jump to a desired address in the
flash memory
Execute software commands
(3)
(2)
25. Flash Memory Version