32182 datasheet(156/755 Pages) RENESAS

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6-21

INTERNAL MEMORY

32182 Group User’s Manual (Rev.1.0)

6.5.3 Procedure for Programming/Erasing the Internal Flash Memory

To program or erase the internal flash memory, set up chip mode to enter flash E/W enable mode and execute the

flash write/erase program in the internal RAM into which it has been transferred from the internal flash memory.

In flash E/W enable mode, because the internal flash memory cannot be accessed for read as in normal mode,

no programs present in it can be executed. Therefore, the flash write/erase program must be made available in

the internal RAM before entering flash E/W enable mode. (Once flash E/W enable mode is entered into, only

flash commands and no other commands can be used to access the internal flash memory.)

To access the internal flash memory in flash E/W enable mode, issue commands for the internal flash memory

address to be operated on. The table below lists the commands that can be issued in flash E/W enable mode.

Note: • During flash E/W enable mode, the internal flash memory cannot be accessed for read or write

wordwise.

Table 6.5.2 Commands in Flash E/W Enable Mode

Command Name

Issued Command Data

Read Array command

H'FFFF

Page Program command

H'4141

Lock Bit Program command

H'7777

Block Erase command

H'2020

Erase All Unlocked Blocks command

H'A7A7

Read Status Register command

H'7070

Clear Status Register command

H'5050

Read Lock Bit Status command

H'7171

Verify command (Note 1)

H'D0D0

Note 1: • This command is used in conjunction with Lock Bit Program, Block Erase and Erase All Unlocked Blocks

operations.

• This command must be issued immediately after the Lock Bit Program, Block Erase or Erase All Unlocked Blocks

command.

• If the Lock Bit Program, Block Erase or Erase All Unlocked Blocks command is followed by the Read Array com-

mand (H’FFFF), the Lock Bit Program, Block Erase or Erase All Unlocked Blocks command is canceled.

• If the Lock Bit Program, Block Erase or Erase All Unlocked Blocks command is followed by other than the Verify

(H'D0D0) or Read Array (H'FFFF) command, the Lock Bit Program, Block Erase or Erase All Unlocked Blocks

command is not executed normally and terminated in error.

(1) Read Array command

Writing the command (H’FFFF) to any address of the internal flash memory places it in read mode. Then read

the desired flash memory address, and the content of that address will be read out.

Before exiting flash E/W enable mode, always be sure to execute the Read Array command.

6.5 Programming the Internal Flash Memory

START

Write the Read Array command (H'FFFF)

to any address of the internal flash memory

Read the desired flash memory address

END

Figure 6.5.7 Read Array Command

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