Register, 1 flash security control register, Register 3 – FUJITSU MB91460 SERIES FR60 User Manual
Page 1029: Register 4.1 flash security control register

1013
Chapter 55 Flash Security
4.Register
4. Register
4.1 Flash Security Control Register
■
FSCR0: Address 7100h (Access: Byte (write), Word (read))
Meaning of Bit Attribute Symbols (Page No.10)
” for details of the attributes.)
• Bit31-24: Sequence activation
Continuously writing
“
A5
H
”
,
“
5A
H
”
in the FSCR0[31:24] register will start a Flash Security Vector Re-fetch
sequence immediately after writing
“
5A
H
”
. There is no time restrictions between
“
A5
H
”
and
“
5A
H
”
, but if
“
A5
H
”
is
written followed by the one other than
“
5A
H
”
, you should write
“
A5
H
”
again. If not, the Re-Fetch sequence
cannot be started even if
“
5A
H
”
is written.
Continuously writing
“
F0
H
”
,
“
0F
H
”
in the FSCR0[31:24] register will start a CRC32 checksum sequence
immediately after writing
“
0F
H
”
. There is no time restrictions between
“
F0
H
”
and
“
0F
H
”
, but if
“
F0
H
”
is written
followed by the one other than
“
0F
H
”
, you should write
“
F0
H
”
again. If not, the CRC checksum sequence
cannot be started even if
“
0F
H
”
is written.
31
30
29
28
27
26
25
24
bit
CRC31/
S7
CRC30/
S6
CRC29/
S5
CRC28/
S4
CRC27/
S3
CRC26/
S2
CRC25/
S1
CRC24/
S0
1
1
1
1
1
1
1
1
Initial value (
INIT pin input,
watchdog reset
)
X
X
X
X
X
X
X
X
Initial value
(Software reset)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Attribute
23
22
21
20
19
18
17
16
bit
CRC23
CRC22
CRC21
CRC20
CRC19
CRC18
CRC17
CRC16
1
1
1
1
1
1
1
1
Initial value (
INIT pin input,
watchdog reset
)
X
X
X
X
X
X
X
X
Initial value
(Software reset)
R
R
R
R
R
R
R
R
Attribute
15
14
13
12
11
10
9
8
bit
CRC15
CRC14
CRC13
CRC12
CRC11
CRC10
CRC9
CRC8
1
1
1
1
1
1
1
1
Initial value (
INIT pin input,
watchdog reset
)
X
X
X
X
X
X
X
X
Initial value
(Software reset)
R
R
R
R
R
R
R
R
Attribute
7
6
5
4
3
2
1
0
bit
CRC7
CRC6
CRC5
CRC4
CRC3
CRC2
CRC1
CRC0
1
1
1
1
1
1
1
1
Initial value (
INIT pin input,
watchdog reset
)
X
X
X
X
X
X
X
X
Initial value
(Software reset)
R
R
R
R
R
R
R
R
Attribute
S7-S0
Function
0xA5 -> 0x5A
Start of a Flash Security Vector Re-Fetch Sequence (write only)
0xF0 -> 0X0F
Start of a Flash Memory CRC32 Checksum Sequence (write only)