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20.5 Protection
There are three kinds of flash memory program/erase protection: hardware, software, and error
protection.
20.5.1 Hardware
Protection
Programming and erasing of flash memory is forcibly disabled or suspended by hardware
protection. In this state, the downloading of an on-chip program and initialization are possible.
However, an activated program for programming or erasure cannot program or erase the user
MAT, and the error in programming/erasing is reported in the parameter FPFR.
Table 20.9 Hardware Protection
Function to be Protected
Item Description
Download
Program/Erase
FWE pin
protection
•
When a low level signal is input to the FWE
pin, the FWE bit in FCCS is cleared and the
program/erase-protected state is entered.
Reset/standby
protection
•
The program/erase interface registers are
initialized by a reset (including a reset by the
WDT) and in hardware standby mode and
the program/erase-protected state is
entered.
•
The reset state will not be entered by a reset
using the
RES
pin unless the
RES
pin is held
low until oscillation has stabilized after power
is initially supplied. In the case of a reset
during operation, hold the
RES
pin low for
the RES pulse width that is specified in the
section on AC characteristics. If a reset is
input during programming or erasure, data
values in the flash memory are not
guaranteed. In this case, execute erasure
and then execute programming again.
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