H8SXSLASH1663 datasheet(941/1158 Pages) RENESAS

941 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 889 of 1102

REJ09B0294-0100

(4) Flash Key Code Register (FKEY)

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

perform programming/erasing of the flash memory.

R/W

Bit

Bit Name

Initial Value

R/W

Bit

Bit Name

Initial

Value

R/W

Description

R/W

Key Code

When H'A5 is written to FKEY, writing to the SCO bit in

FCCS is enabled. When a value other than H'A5 is

written, the SCO bit cannot be set to 1. Therefore, the

on-chip program cannot be downloaded to the on-chip

RAM.

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

the flash memory be executed. When a value other than

H'5A is written, even if the programming/erasing

program is executed, programming/erasing cannot be

performed.

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

cannot be set to 1 when FKEY is a value other

than H'A5.)

H'5A: Programming/erasing of the flash memory is

enabled. (When FKEY is a value other than

H'A5, the software protection state is entered.)

H'00: Initial value

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