3069RF-ZTAT Datasheet, PDF (651/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Table 18.9 Hardware Protection
Item
FWE-pin protection
Reset/standby
protection
Description
• The input of a low-level signal on the
FWE pin clears the FWE bit of
FCCS and the device enters a
program/erase-protected state.
• A power-on reset (including a
power-on reset by the WDT) and
entry to standby mode reinitialize
the program/erase interface register
and the device enters a
program/erase-protected state.
• Resetting by means of the RES pin
after power is initially supplied will
not make the device enter the reset
state unless the RES pin is held low
until oscillation has stabilized. 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
section. If the device is reset during
programming or erasure, data
values in the flash memory are not
guaranteed. In this case, after
keeping the RES pin low for at least
100 µs, execute erasure and then
execute programming again.
Function to be Protected
Download
Program/Erase
—
18.6.2 Software Protection
Software protection is set up in any of three ways: by disabling the downloading of on-chip
programs for programming and erasing, by means of a key code, and by the RAM-emulation
register.
Rev. 5.0, 09/04, page 629 of 978