Software Protection; Error Protection; Table 21.10 Software Protection - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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Software Protection

Software protection is set up by disabling download of on-chip programming/erasing programs or

by means of a key code.

Protection by

Protection by

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

form of the microcomputer entering runaway during programming/erasing of the flash memory or

operations that are not following the stipulated 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 microcomputer malfunctions during programming/erasing of the flash memory, the FLER

bit in FCCS is set to 1 and the error-protection state is entered, and this aborts the programming or

The FLER bit is set to 1 in the following conditions:

• When an interrupt such as NMI occurs during programming/erasing.

• When the flash memory is read during programming/erasing (including a vector read or an

instruction fetch).

• When a SLEEP instruction (including software-standby mode) is executed during

programming/erasing.

The programming/erasing protection state

is entered by clearing the SCO bit in FCCS

to 0 to disable downloading of the

programming/erasing programs.

Downloading and programming/erasing are

disabled unless the required key code is

written in FKEY. Different key codes are

used for downloading and

programming/erasing.

Section 21 Flash Memory (0.18-µm F-ZTAT Version)

Function to be Protected

Rev. 3.00 Jul. 14, 2005 Page 793 of 986

Programming/

REJ09B0098-0300

H8s/2100 series H8s/2114r R4f2114r