p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 553

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

19.5.2
Software protection is set up by disabling download of on-chip programming/erasing programs or
by means of a key code.
Table 19.10 Software Protection
19.5.3
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
erasure.
The FLER bit is set to 1 in the following conditions:
1. When an interrupt such as NMI occurs during programming/erasing.
2. When the flash memory is read during programming/erasing (including a vector read or an
3. When a SLEEP instruction (including software-standby mode) is executed during
Item
Protection by
SCO bit
Protection by
FKEY
instruction fetch).
programming/erasing.
Software Protection
Error Protection
Description
•
•
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 19 Flash Memory (0.18-µm F-ZTAT Version)
Rev. 1.00 Sep. 21, 2006 Page 515 of 658
Download
Ο
Ο
Function to be Protected
REJ09B0310-0100
Programming/
Erasure
Ο
Ο