Freescale Semiconductor EETX4K Eprot Eeprom Protection Register, Eeprom Protection Register Eprot

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Block Guide — S12EETX4KV0 V00.04

3.3.5 EPROT — EEPROM Protection Register

The EPROT register defines which EEPROM sectors are protected against program or erase operations.

Address Offset: $_04

 

7

6

5

4

3

2

1

0

R

EPOPEN

RNV6

RNV5

RNV4

EPDIS

EPS2

EPS1

EPS0

W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

F

F

F

F

F

F

F

F

= Unimplemented or Reserved

Figure 3-6 EEPROM Protection Register (EPROT)

All bits in the EPROT register are readable and writable except for RNV[6:4] which are only readable. The EPOPEN and EPDIS bits can only be written to the protected state. The EPS bits can be written anytime until bit EPDIS is cleared. If the EPOPEN bit is cleared, the state of the EPDIS and EPS bits is irrelevant.

During the reset sequence, the EPROT register is loaded from the EEPROM Protection byte at address offset $_FFD (see Table 3-1 EEPROM Configuration Field). To change the EEPROM protection that will be loaded during the reset sequence, the EEPROM memory must be unprotected, then the EEPROM Protection byte must be reprogrammed. Trying to alter data in any protected area in the EEPROM memory will result in a protection violation error and the PVIOL flag will be set in the ESTAT register. The mass erase of an EEPROM block is possible only when protection is fully disabled by setting the EPOPEN and EPDIS bits.

EPOPEN — Opens the EEPROM for program or erase.

1 = The EEPROM sectors not protected are enabled for program or erase. 0 = The entire EEPROM memory is protected from program and erase.

RNV[6:4] — Reserved Non-Volatile Bits.

The RNV[6:4] bits should remain in the erased state “1” for future enhancements.

EPDIS — EEPROM Protection address range Disable.

The EPDIS bit determines whether there is a protected area in a specific region of the EEPROM memory ending with address offset $_FFF.

1 = Protection disabled.

0 = Protection enabled.

EPS[2:0] — EEPROM Protection Address Size.

The EPS[2:0] bits determine the size of the protected area as shown inTable 3-3. The EPS bits can only be written to while the EPDIS bit is set.

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Go to: www.freescale.com

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Contents Original Release Date 7 JUL Revised 30 OCT Motorola, Inc Freescale Semiconductor, IncRevision History Table of Contents Freescale Semiconductor, Inc List of Figures Freescale Semiconductor, Inc List of Tables Freescale Semiconductor, Inc Freescale Semiconductor, Inc Freescale Semiconductor, Inc Modes of Operation FeaturesIntroduction OverviewDivider Block DiagramInterface ClockExternal Signal Description Module Memory Map Memory Map and RegistersEeprom Configuration Field Eeprom Memory Map Eeprom Register Map Address Register Name Normal Mode Offset AccessEclkdiv Eeprom Clock Divider Register Register DescriptionsRESERVED2 Ecnfg Eeprom Configuration RegisterEeprom Protection Register Eprot Eprot Eeprom Protection RegisterEeprom Protection Address Range Estat Eeprom Status RegisterEcmd Eeprom Command Register Valid Eeprom Command List Eeprom Command Register EcmdEdata Eeprom Data Registers Eaddr Eeprom Address Registers13 Eeprom Data Low Register Edatalo Functional Description Eeprom Command OperationsWriting the Eclkdiv Register 200 -182 ⁄ 200 × 100 = 9% Determination Procedure for PRDIV8 and Ediv Bits Eeprom Commands Command Write SequenceEeprom Command Description Sector Erase Verify CommandExample Erase Verify Command Flow Program Command Freescale Semiconductor, Inc Example Program Command Flow Sector Erase Command Freescale Semiconductor, Inc Example Sector Erase Command Flow Mass Erase Command Example Mass Erase Command Flow Sector Erase Abort Command Freescale Semiconductor, Inc Ccif Illegal Eeprom Operations Example Sector Modify Command Flow3.5 Unsecuring the MCU in Special Single Chip Mode via the BDM Wait ModeStop Mode Background Debug ModeInterrupts ResetsEeprom Reset Sequence Reset While Eeprom Command ActiveEeprom Interrupt Implementation Index Freescale Semiconductor, Inc Block Guide End Sheet Final Pages

Block Guide, EETX4K specifications

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