M32CSLASH86 datasheet(421/505 Pages) RENESAS

421 / 505 page

Page 398

25. Flash Memory Version

)

(

25.3.3 Flash Memory Control Register (FMR0 Register and FMR1 Register)

Figure 25.4 FMR0 Register

Flash Memory Control Register 0

Symbol

Address

After Reset

FMR0

005716

0000 00012

FMR00

FMR01

FMR02

RY/BY Status Flag

FMSTP

(b4)

FMR05

FMR06

FMR07

CPU Rewrite Mode

Select Bit(1, 7)

Lock Bit Disable

Select Bit(2)

Flash Memory Stop

Bit(3, 5)

User ROM Area Select

Bit(3) (Available in boot

mode only)

Program Status Flag(4)

Erase Status Flag(4)

Bit Name

Function

Bit

Symbol

0 : BUSY (programming or erasing)(6)

1 : READY

0 : Disables CPU rewrite mode

1 : Enables CPU rewrite mode

0 : Enables the lock bit

1 : Disables the lock bit

0 : Starts the flash memory

1 : Stops the flash memory

(Enters low power consumption state

and flash memory is reset)

0 : Boot ROM area is accessed

1 : User ROM area is accessed

0 : Successfully completed

1 : Terminated by error

0 : Successfully completed

1 : Terminated by error

Reserved Bit

Set to "0"

NOTES:

1. Set the FMR01 bit while the NMI pin is held "H". Set it by program in a space other than the flash

memory in EW mode 0.

2. Set the FMR02 bit to "1" in 8-bit unit immediately after setting it first to "0" while the FMR01 bit is set to

"1". Do not generate an interrupt or a DMA transfer between setting the FMR02 bit to "0" and setting it

to "1".

3. Set the FMSTP and FMR05 bits by program in a space other than the flash memory.

4. The FMR07 and FMR06 bits is set to "0" by executing the clear status command.

5. FMSTP bit setting is enabled when the FMR01 bit is set to "1" (CPU rewrite mode enabled).

The FMSTP bit can be set to "1" when the FMR01 bit is set to "0", but the flash memory does not enter

low-power consumption state nor is reset.

6. Write and read operations by the lock bit program command and read lock bit status command are

included.

7. To change a FMR01 bit setting from "0" to "1", set the FMR01 bit to "1" immediately after setting it

first to "0" in 8-bit unit. Do not generate an interrupt or a DMA transfer between setting the FMR01 bit to

"0" and setting it to "1".

To change a 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.

e. g., to change a FMR01 bit setting from "1" to "0";

Assembly language:

mov.w

#0000h, 0057h

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