h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 460
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 460 of 570
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14.5
There are two kinds of flash memory program/erase protection: hardware and software protection.
14.5.1
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 locations in a
user MAT, and the error in programming/erasing is reported in the parameter FPFR.
Table 14.10 Hardware Protection
Rev. 2.00, 03/04, page 428 of 534
Item
FWE pin protection
Reset/standby
protection
Protection
Hardware Protection
Description
•
•
•
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.
The program/erase interface registers
are initialized in the reset state
(including a reset by the WDT) and
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 program again.
Download
Function to be Protected
Program/Erase
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