M32CSLASH8B datasheet(318/406 Pages) RENESAS

318 / 406 page

Under development

M32C/8B Group

23. Flash Memory

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 301 of 385

23.2

Registers

Figures 23.2 to 23.4 show registers associated with the flash memory.

Figure 23.2

FMR0 Register

b6 b5 b4

Symbol

FMR0

Address

0057h

After Reset

0000 0001b

Function

Bit Symbol

Bit Name

FMR05

FMR07

Flash memory stop bit(3)(5)

Erase status flag(4)

−

(b4)

FMSTP

User ROM area select bit(3)

(available in boot mode only)

Program status flag(4)

FMR06

Flash Memory Control Register 0

Reserved bit

CPU rewrite mode select bit(1)(7)

FMR01

Lock bit disable select bit(2)

FMR02

0: BUSY (programming or erasing in progress)(6)

1: READY

RY/BY status flag

FMR00

0: CPU rewrite mode disabled

1: CPU rewrite mode enabled

0: Lock bit enabled

1: Lock bit disabled

0: Flash memory started

1: Flash memory stopped

(enters low-power consumption state and flash

memory is initialized)

Set to 0

0: Boot ROM area accessed

1: User ROM area accessed

0: Successfully completed

1: Terminated by error

0: Successfully completed

1: Terminated by error

NOTES:

1. Set bits FMR01 and FMR02 while the NMI pin level is held "H".

2. To set the FMR02 bit to 1, write a 1 to the FMR02 bit immediately after writing a 0 to the bit while the FMR01 bit is set to 1.

Write the value in 8-bit units. Do not generate an interrupt or a DMA or DMACII transfer between these two settings.

3. Set bits FMSTP and FMR05 by the program placed in an area other than the flash memory.

4. Bits FMR07 and FMR06 are set to 0 by executing the clear status command.

5. The FMSTP bit is enabled when the FMR01 bit is set to 1 (CPU rewrite mode enabled). Bits FMSTP can be set to 1 even

when the FMR01 bit is set to 0, but the flash memory does not enter low-power consumption state nor is initialized.

6. Program and read operations by lock bit program command, read lock bit status command, and protect bit program command

are included.

7. To change the FMR01 bit from 0 to 1, write a 1 to the FMR01 bit immediately after writing a 0 to it. Write the value in 8-bit

units. Do not generate an interrupt or a DMA or DMACII transfer between these two settings.

To change the FMR01 bit from 1 to 0

, enter read array mode first, and then write to the address 0057h in 16-bit units. Set

the eight high-order bits to 00h.

e.g., To change the FMR01 bit from 1 to 0;

Assembly language: mov.w #0000h, 0057h

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