Philips P89LPC907 用户手册

2003 Dec 8     

97

There are four User Sector Security Bytes (SEC0, ..., SEC3), each corresponding to one sector and having the following bit 
assignments:

0

0

0

None.

0

0

1

Security violation flag set for sector CRC calculation for the specific sector. Security 
violation flag set for global CRC calculation if any MOVCDISx  bit is set. Cycle aborted. 
Memory contents unchanged. CRC invalid. Program/erase commands will not result 
in a security violation.

0

1

x

Security violation flag set for program commands or an erase page command. Cycle 
aborted. Memory contents unchanged. Sector erase and global erase are allowed.

1

x

x

Security violation flag set for program or erase commands. Cycle aborted. Memory 
contents unchanged. Global erase is allowed.

SECx
Address: xxxxh

Unprogrammed value: 00h

SECx.7-3

-

Reserved (should remain unprogrammed at zero).

SECx.2

EDISx

Erase Disable x. Disables the ability to perform an erase of sector "x" in IAP mode. When 
programmed, this bit and sector x  can only be erased  by a 'global' erase command using 
a commercial programmer . This bit and sector x CANNOT be erased in  IAP mode. 

SECx.1

SPEDISx

Sector Program Erase Disable x. Disables program or erase of all or part of sector x. 
This bit and sector x are erased by either a sector erase command (IAP or commercial 
programmer) or a 'global' erase command (commercial programmer).

SECx.0

MOVCDISx

MOVC Disable. Disables the MOVC command for sector x. Any MOVC that attempts to 
read a byte in a MOVC protected sector will return invalid data. This bit can only be erased 
when sector x is erased.

7

6

5

4

3

2

1

0

-

-

-

-

-

EDISx

     

SPEDISx

  

MOVCDISx