ez80f92 ZiLOG Semiconductor, ez80f92 Datasheet - Page 209

• Manufacturer Part Number: ez80f92
• Description: Ez80acclaim Flash Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS015313-0508
Note:
Flash Write/Erase Protection Register
The Flash Write/Erase Protection register prevents accidental Write or Erase operations.
The protection is limited to a resolution of eight 16 KB blocks. Setting a bit to 1 protects
that 16 KB block of Flash memory from accidental writing or erasure. Default on RESET
is for all Flash memory blocks to be protected.
Writes to this register are allowed only after it is unlocked via the FLASH_KEY register.
Any attempted Writes to this register while locked sets it to
blocks.
Table 119. Flash Write/Erase Protection Register; (FLASH_PROT= 00FAh)
Bit
Reset
CPU Access
Note: R/W = Read/Write if unlocked, R = Read Only if locked. *Key sequence required to unlock.
Bit
Position
[7]*
BLK7_PROT
[6]*
BLK6_PROT
[5]*
BLK5_PROT
[4]*
BLK4_PROT
[3]
BLK3_PROT
[2]
BLK2_PROT
[1]
BLK1_PROT
Note: *Unused in the eZ80F93 device.
A protect bit is not available for the Information Page. Mass Erase is prevented if
any of the bits in this register are set to 1.
Value Description
0
1
0
1
0
1
0
1
0
1
0
1
0
1
R/W*
Disable Write/Erase Protect on block 0x1C000 to 0x1FFFF
Enable Write/Erase Protect on block 0x1C000 to 0x1FFFF
Disable Write/Erase Protect on block 0x18000 to 0x1BFFF
Enable Write/Erase Protect on block 0x18000 to 0x1BFFF
Disable Write/Erase Protect on block 0x14000 to 0x17FFF
Enable Write/Erase Protect on block 0x14000 to 0x17FFF
Disable Write/Erase Protect on block 0x10000 to 0x13FFF
Enable Write/Erase Protect on block 0x10000 to 0x13FFF
Disable Write/Erase Protect on block 0x0C000 to 0x0FFFF
Enable Write/Erase Protect on block 0x0C000 to 0x0FFFF
Disable Write/Erase Protect on block 0x08000 to 0x0BFFF
Enable Write/Erase Protect on block 0x08000 to 0x0BFFF
Disable Write/Erase Protect on block 0x04000 to 0x07FFF
Enable Write/Erase Protect on block 0x04000 to 0x07FFF
7
1
R/W*
6
1
R/W*
5
1
R/W*
4
1
R/W*
FFh
3
1
, thereby protecting all
Product Specification
R/W*
2
1
eZ80F92/eZ80F93
R/W*
1
1
Flash Memory
R/W*
0
1
202