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H8SX/1663M Datasheet(PDF) 1154 Page - Renesas Technology Corp

Part # H8SX/1663M
Description  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1504 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8SX/1663M Datasheet(HTML) 1154 Page - Renesas Technology Corp

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Section 25 Flash Memory
Rev. 2.00 Sep. 24, 2008 Page 1122 of 1468
REJ09B0412-0200
(4)
Flash Key Code Register (FKEY)
FKEY is a register for software protection that enables to download the on-chip program and
perform programming/erasure of the flash memory.
7
K7
0
R/W
6
K6
0
R/W
5
K5
0
R/W
4
K4
0
R/W
3
K3
0
R/W
0
K0
0
R/W
2
K2
0
R/W
1
K1
0
R/W
Bit
Bit Name
Initial Value
R/W
Bit
Bit Name
Initial
Value
R/W
Description
7
6
5
4
3
2
1
0
K7
K6
K5
K4
K3
K2
K1
K0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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/erasure of
the flash memory be executed. When a value other than
H'5A is written, even if the programming/erasing
program is executed, programming/erasure cannot be
performed.
H'A5: Writing to the SCO bit is enabled. (The SCO bit
cannot be set to 1 when FKEY is a value other
than H'A5.)
H'5A: Programming/erasure of the flash memory is
enabled. (When FKEY is a value other than H'A5,
the software protection state is entered.)
H'00: Initial value



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