M32CSLASH86 datasheet(424/505 Pages) RENESAS

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Page 401

25. Flash Memory Version

)

(

Execute the read array command(3)

Single-chip mode, memory expansion

mode or boot mode

Set MCD and PM1 registers(1)

Execute the software commands

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)

Transfer the rewrite control program in CPU

rewrite mode to a space other than the flash

memory

In boot mode only

Set the FMR05 bit to "0" (boot ROM area

accessed)(4)

Set the FMR01 bit to "0"

(CPU rewrite mode disabled)(5)

In boot mode only

Set the FMR05 bit to "1"(user ROM area accessed)

Set the FMR01 bit to "1" (CPU rewrite mode

enabled) after writing "0"(2)

Procedure to Enter EW Mode 0

Rewrite control program

Jump to a desired address in 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 005716 in 16-bit

unit. Write "0016" into 8 high-order bits.

Figure 25.6 How to Enter and Exit EW Mode 0

M32C/86 Datasheet(PDF) 424 Page - Renesas Technology Corp