R5F61525 RENESAS [Renesas Technology Corp], R5F61525 Datasheet - Page 621

• Manufacturer Part Number: R5F61525
• Description: 32-Bit CISC Microcomputer H8SX Family H8SX/1500 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

(4)
FKEY is a register for software protection that enables to download the on-chip program and
perform programming/erasing of the flash memory.
Bit
7
6
5
4
3
2
1
0
Bit
Bit Name
Initial Value
R/W
Flash Key Code Register (FKEY)
Bit Name
K7
K6
K5
K4
K3
K2
K1
K0
R/W
K7
7
0
Initial
Value
0
0
0
0
0
0
0
0
R/W
K6
6
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
K5
5
0
Description
Key Code
When H'A5 is written to FKEY, writing to the SCO bit in
FCCS is enabled. When a value other than H'A5 is
written, the SCO bit cannot be set to 1. Therefore, the
on-chip program cannot be downloaded to the on-chip
RAM.
Only when H'5A is written can programming/erasing of
the flash memory be executed. When a value other than
H'5A is written, even if the programming/erasing
program is executed, programming/erasing cannot be
performed.
H'A5: Writing to the SCO bit is enabled. (The SCO bit
H'5A: Programming/erasing of the flash memory is
H'00: Initial value
R/W
K4
4
0
cannot be set to 1 when FKEY is a value other
than H'A5.)
enabled. (When FKEY is a value other than
H'5A, the software protection state is entered.)
Section 17 Flash Memory (0.18-(m F-ZTAT Version)
R/W
K3
3
0
Rev. 3.00 Mar. 14, 2006 Page 583 of 804
R/W
K2
2
0
R/W
K1
1
0
REJ09B0104-0300
R/W
K0
0
0