Freescale Semiconductor Block Guide, EETX4K - page 33

Block Guide — S12EETX4KV0 V00.04

33

An example flow to execute the sector erase operation is shown in Figure 4-4. The sector erase command

write sequence is as follows:

1. Write to an EEPROM memory address to start the command write sequence for the sector erase

command. The EEPROM address written determines the sector to be erased while global address

bits [1:0] and the data written are ignored.

2. Write the sector erase command, $40, to the ECMD register.

3. Clear the CBEIF flag in the ESTAT register by writing a “1” to CBEIF to launch the sector erase

command.

If an EEPROM sector to be erased is in a protected area of the EEPROM memory, the PVIOL flag in the

ESTAT register will set and the sector erase command will not launch. Once the sector erase command

hassuccessfully launched, the CCIF flag in the ESTAT register will set after the sector erase operation has

completed unless a new command write sequence has been buffered.

Freescale Semiconductor, I

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

nc...

Contents

Main EETX4K Block Guide V00.04 Page Table of Contents Section 1 Introduction Section 2 External Signal Description Section 3 Memory Map and Registers Section 4 Functional Description Page List of Figures Page List of Tables Page Page Page Section 1 Introduction 1.1 Overview 1.1.1 Glossary Command Write Sequence 1.2 Features EETX4K Page Section 3 Memory Map and Registers 3.1 Overview 3.2 Module Memory Map Figure 3-1 EEPROM Memory Map Page 3.3 Register Descriptions 3.3.1 ECLKDIV EEPROM Clock Divider Register 3.3.2 RESERVED1 3.3.3 RESERVED2 3.3.4 ECNFG EEPROM Configuration Register 3.3.5 EPROT EEPROM Protection Register 3.3.6 ESTAT EEPROM Status Register 3.3.7 ECMD EEPROM Command Register 3.3.8 RESERVED3 3.3.9 EADDR EEPROM Address Registers 3.3.10 EDATA EEPROM Data Registers Page Section 4 Functional Description 4.1 EEPROM Command Operations 4.1.1 Writing the ECLKDIV Register Page Figure 4-1 Determination Procedure for PRDIV8 and EDIV Bits 4.1.2 Command Write Sequence 4.1.3 EEPROM Commands Page Page Page Page Figure 4-7 Example Sector Modify Command Flow 4.1.4 Illegal EEPROM Operations Page 4.2 Wait Mode 4.3 Stop Mode 4.4 Background Debug Mode 4.5 EEPROM Module Security 4.5.1 Unsecuring the MCU in Special Single Chip Mode via the BDM 4.6 Resets 4.6.1 EEPROM Reset Sequence 4.6.2 Reset While EEPROM Command Active 4.7 Interrupts 4.7.1 Description of EEPROM Interrupt Operation Page Index