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Chapter 55 Flash Security
4.Register
4. Register
4.1 Flash Security Control Register
■ FSCR0: Address 7100h (Access: Byte (write), Word (read))
(See “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
11111111
Initial value (
INIT pininput,
watchdog reset
)
XXXXXXXX
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
11111111
Initial value (
INIT pininput,
watchdog reset)
XXXXXXXX
Initial value
(Software reset)
RRRRRRRR Attribute
15 14 13 12 11 10 9 8 bit
CRC15 CRC14 CRC13 CRC12 CRC11 CRC10 CRC9 CRC8
11111111
Initial value (
INIT pininput,
watchdog reset)
XXXXXXXX
Initial value
(Software reset)
RRRRRRRR Attribute
76543210 bit
CRC7 CRC6 CRC5 CRC4 CRC3 CRC2 CRC1 CRC0
11111111
Initial value (
INIT pininput,
watchdog reset)
XXXXXXXX
Initial value
(Software reset)
RRRRRRRR 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)