R5F72115D160FPV datasheet(926/1228 Pages) RENESAS

926 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 902 of 1200

REJ09B0344-0200

Bit

Bit Name

Initial

Value

R/W

Description

EPVB

R/W

Erase Pulse Verify Block

Selects the erasing program.

0: On-chip erasing program is not selected

[Clearing condition]

When transfer is completed

1: On-chip erasing program is selected

(4)

Flash Key Code Register (FKEY)

FKEY is a register for software protection that enables download of the on-chip program and

programming/erasing of flash memory. Before setting the SCO bit to 1 in order to download the

on-chip program or executing the downloaded programming/erasing program, these processings

cannot be executed if the key code is not written.

Bit:

Initial value:

R/W:

7654321

00000000

R/W

K[7:0]

Bit

Bit Name

Initial

Value

R/W

Description

7 to 0

K[7:0]

All 0

R/W

Key Code

Only when H'A5 is written, writing to the SCO bit is valid.

When a value other than H'A5 is written to FKEY, 1

cannot be written to the SCO bit. Therefore downloading

to the on-chip RAM cannot be executed.

Only when H'5A is written, programming/erasing of flash

memory can be executed. Even if the on-chip

programming/erasing program is executed, flash memory

cannot be programmed or erased when a value other than

H'5A is written to FKEY.

H'A5: Writing to the SCO bit is enabled (The SCO bit

cannot be set by a value other than H'A5.)

H'5A: Programming/erasing is enabled (A value other than

H'5A enables software protection state.)

H'00: Initial value

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