Freescale Semiconductor Block Guide, EETX4K Example Sector Erase Command Flow Mass Erase Command

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Block Guide — S12EETX4KV0 V00.04

START

	Read: ECLKDIV register
Clock Register							NOTE: ECLKDIV needs to
		EDIVLD			no
Written
		Set?					be set once after each reset.
Check		yes
			Write: ECLKDIV register
			Read: ESTAT register
Address, Data,
				CBEIF		no
Command
				Set?
Buffer Empty Check
				yes
Access Error and				ACCERR/		yes
							Write: ESTAT register
Protection Violation				PVIOL			Clear ACCERR/PVIOL $30
				Set?
Check
				no

1.	Write: EEPROM Sector Address
	and Dummy Data
		NOTE: command write sequence
2.	Write: ECMD register
		aborted by writing $00 to
	Sector Erase Command $40
		ESTAT register.
		NOTE: command write sequence
	Write: ESTAT register
3.		aborted by writing $00 to
	Clear CBEIF $80
		ESTAT register.
	Read: ESTAT register

Bit Polling for

Command Completion CCIFno

Set?

Check

yes

EXIT

Figure 4-4 Example Sector Erase Command Flow

4.1.3.4 Mass Erase Command

The mass erase operation will erase all addresses in an EEPROM block using an embedded algorithm.

An example flow to execute the mass erase operation is shown in Figure 4-5. The mass erase command write sequence is as follows:

1.Write to an EEPROM memory address to start the command write sequence for the mass erase command. The address and data written will be ignored.

2.Write the mass erase command, $41, to the ECMD register.

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

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