SH33F2801PSLASH032PR datasheet(28/407 Pages) SINOWEALTH

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SH33F2801

8.3.3.2

Flash Control Register Unlock

After the system is reset, the flash memory operation register is locked, so the flash memory operation register needs to

be unlocked before performing erasure programming operation on flash. Different flash memory blocks have different unlock

registers, and corresponding registers need to be unlocked to execute operations to different blocks. To unlock flash, two

unlocking values are required to be written to the corresponding unlock register. Whenever writing error occurs on the first or

the second key value, the corresponding flash block cannot be unlocked, and a bus error will be generated. Unlocking the

unlock register when any one block is unlocked will also generate a bus error. There are also two cases on flash unlocking

operations. One is to perform a single operation on flash after unlocking, while the other to perform multiple operations on

flash after unlocking. If the flash memory operation register is in unlock state, the flash memory block can be erased and

programmed by controlling FLASH_CR.

After reset, bit MNLCK@FLASH_CR is set to 1. The FLASH_CR can be unlocked by first writing the flash unlock value

0x8ACE 0246 to the FLASH_MKYR register, then writing the single operation unlock value 0xC3C3 C3C3 or the multiple

operation unlock value 0xB4B4 B4B4 to the FLASH_MKYR register. After two correct unlock values writing operations are

completed, bit MNLCK@FLASH_CR is cleared by hardware. The software can set the control bit MNLCK@FLASH_CR to 1

to lock the main program block. Main program block is locked by the FLASH_MKYR register. After unlocking, the main

program block can be operated by running a program in RAM, running a program in the main program block, running a

program in boot block, or directly accessing the flash operation register using a debugging tool.

EEPROM-like block of the special information block can be locked by the FLASH_E2KYR register. The unlocking

process also contains two write operations. After flash unlock value 0x9BDF 1357 is written to FLASH_E2KYR register, and

single operation unlock value 0xC3C3 C3C3 or multiple operation unlock value 0xB4B4 B4B4 is written to FLASH_E2KYR

the control bit E2LCK@FLASH_CR to 1 to lock the EEPROM-like block of the special information block. It is the

EEPROM-like block of the special information block which is locked by FLASH_E2KYR register. After this block is unlocked,

operations can be performed by running a program in RAM, running a program in the main program block, running a

program in boot block, or directly accessing the flash operation register using a debugging tool.

OTP block of the special information block can be locked by the FLASH_IKYR register. The unlocking process also

contains two write operations. After flash unlock value 0xABCD 5678 is written to FLASH_IKYR register, and single

operation unlock value 0xC3C3 C3C3 or multiple operation unlock value 0xB4B4 B4B4 is written to FLASH_IKYR register,

this block can be unlocked and the control bit INFLCK@FLASH_CR is cleared by hardware. The software can set the control

bit INFLCK@FLASH_CR to 1 to lock the OTP block of the special information block. It is the OTP block of the special

information block which is locked by FLASH_IKYR register. OTP block can be operated by running a program in RAM or a

program in the main program block.

For flash single unlock operation, after MNLCK@FLASH_CR or E2WRE/INFLCK@FLASH_CR is cleared to 0, only one

programming or erasing operation on flash is allowed. After the operation is completed, MNLCK@FLASH_CR or

E2WRE/INFLCK@FLASH_CR is automatically set to 1 by hardware, locking the related flash block again.

For flash multiple unlock operation, after MNLCK@FLASH_CR or E2WRE/INFLCK@FLASH_CR is cleared to 0, only

one programming or erasing operation on flash is allowed. After the operation is completed, MNLCK@FLASH_CR or

E2WRE/INFLCK@FLASH_CR must be set to 1 by software, and then the related flash block can be locked again.

Table8-4

Unlock Value and Description of Each Unlocking Register

Function

Flash Initial

Unlock Value

Flash Single

Operation

Unlock Value

Flash Multiple

Operation

Unlock/Lock

Value

Description

FLASH_M

KYR

Unlock main program

block

0x8ACE 0246

0xC3C3 C3C3

0xB4B4 B4B4

Directly access by running a

program in RAM or a

program in main program

block

FLASH_E

2KYR

Unlock EEPROM-like

block of special

information block

0x9BDF 1357

0xC3C3 C3C3

0xB4B4 B4B4

Directly access by running a

program in RAM or a

program in main program

block

FLASH_I

KYR

Unlock OTP block of

special information

block

0xABCD 5678

0xC3C3 C3C3

0xB4B4 B4B4

Directly access by running a

program in RAM or a

program in main program

block

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