7.5 Write Protection

The AT34C04 incorporates a Reversible Software Write Protection (RSWP) feature that allows the ability to selectively write protect data stored in each of the four independent 128-byte EEPROM quadrants. Table 7-2 7-3 identifies the memory quadrant identifier with its associated quadrant, SPA and memory address locations.

The AT34C04 has three RSWP software commands:

• Set RSWP command for setting the RSWP.
• Clear RSWP command for resetting all of the quadrants to an unprotected state.
• Read RSWP command for checking the RSWP status.