32186 datasheet(183/1032 Pages) RENESAS

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INTERNAL MEMORY

6-41

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

123

456

b15

FLBST

???

6.6 Programming Internal Flash Memory

START

Write the Read Lock Bit Status command

(H'7171) to any address of the

internal flash memory

Read the last even address of the

flash memory block to be checked

END

Figure 6.6.13 Read Lock Bit Status (Memory Area Read Mode)

2) Register read mode (FLOCKS bit = 1)

Write the command data (H’7171) to any address of the target block. Next, write the verify command

data (H'D0D0), and the Flash Control Register 4 (FCNT4) FLOCKST (Lock Bit Status) bit shows

whether the target block is protected.

(6) Read Lock Bit Status command

The Read Lock Bit Status command is provided for checking whether a flash memory block is protected

against programming/erase operation. The method for reading lock bit can be chosen from the following

depends on the setting for Flash Control Register 2 (FCNT2) FLOCKS (Lock bit read mode select) bit.

1) Memory area read mode (FLOCKS bit = 0)

Write the command data (H’7171) to any address of the internal flash memory. Next, read the last even

address of the flash memory block to be checked (see Table 6.6.3, “Target Blocks and Specified Ad-

dresses”), and the read data shows whether the target block is protected.

If the FLBST (lock bit) in the read data is "0," it means that the target memory block is protected. If the

FLBST (lock bit) is "1," it means that the target memory block is not protected.

Lock Bit Status Register (FLBST)

Bit Name

Function

0–8

No function assigned.

FLBST

0: Protected

–

Lock bit

1: Not protected

10–15

No function assigned.

The Lock Bit Status Register is a read-only register, which is included for each memory block independently of

one another. To read this register, Flash Control Register 2 (FCNT2) FLOCKS bit must be set to "0."

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