R5F72115D160FPV datasheet(965/1228 Pages) RENESAS

965 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 941 of 1200

REJ09B0344-0200

21.6.2

Software Protection

Software protection is set up in any of two ways: by disabling the downloading of on-chip

programs for programming and erasing, and by means of a key code.

Table 21.9

Software Protection

Function to be Protected

Item

Description

Download

Programming/

Erasure

Protection by the

SCO bit

Clearing the SCO bit in FCCS disables

downloading of the programming/erasing

program, thus making the LSI enter a

programming/erasing-protected state.

√

Protection by FKEY

Downloading and programming/erasing

are disabled unless the required key code

is written in FKEY. Different key codes are

used for downloading and for

programming/erasing.

√

21.6.3

Error Protection

Error protection is a mechanism for aborting programming or erasure when an error occurs, in the

form of the microcontroller getting out of control during programming/erasing of the flash

memory or operations that are not in accordance with the established procedures for

programming/erasing. Aborting programming or erasure in such cases prevents damage to the

flash memory due to excessive programming or erasing.

If the microcontroller malfunctions during programming/erasing of the flash memory, the FLER

bit in FCCS is set to 1 and the LSI enters the error protection state, thus aborting programming or

erasure.

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