Detail Of Register; Fcsbmr] (Flash Security Bit Mask Register); Fcssr] (Flash Security Status Register); Fckcr] (Flash Key Code Register) - Toshiba TXZ Reference Manual

Detail of Register

5.2.1. [FCSBMR] (Flash Security Bit Mask Register)

Bit Bit Symbol
31:1 -
0 SMB
Note: To rewrite this register, follow the procedure below:
1. Write the specific code (0xA74A9D23) to [FCKCR].
2. Rewrite the data of [FCSBMR]<SMB> within 16 clocks after Procedure 1.

5.2.2. [FCSSR] (Flash Security Status Register)

Bit Bit Symbol
31:1 -
0 SEC

5.2.3. [FCKCR] (Flash Key Code Register)

Bit Bit Symbol
31:0 KEYCODE
2018-06-05
Type
After reset
0 R Read as "0"
Security mask bit
1: No masked
0: Masked (Security is temporarily released)
1 R/W When security is enabled ([FCSSR]<SEC>= 1), if "0" is
written to this register, security is temporarily released.
This register is initialized only on the Power On Reset (at
power on or at the return from STOP2 with power
shutdown).
Type
After reset
0 R Read as "0"
Security status: Indicates security status.
0/1 R
The state of security is loaded by a system reset.
Type
After reset
Locked register release key code
When [FCSBMR], [FCPMRn], [FCCR], [FCAREASEL]
are rewritten, write the specific code (0xA74A9D23) to
0x00000000 W this register. And then rewrite the value of the register
within 16 clocks after the previous action.
If invalid data is written to this register within 16 clocks,
released status is reset.
67 / 120
Function
Function
1: Secured
0: Not secured
Function
TXZ Family
Flash Memory
Rev. 2.0