Freescale Semiconductor EETX4K warranty Example Mass Erase Command Flow Sector Erase Abort Command

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Block Guide — S12EETX4KV0 V00.04

If the EEPROM memory to be erased contains any protected area, the PVIOL flag in the ESTAT register will set and the mass erase command will not launch. Once the mass erase command has successfully launched, the CCIF flag in the ESTAT register will set after the mass erase operation has completed unless a new command write sequence has been buffered.

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 Address
	and Dummy Data
		NOTE: command write sequence
2.	Write: ECMD register
		aborted by writing $00 to
	Mass Erase Command $41
		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 4-5 Example Mass Erase Command Flow

4.1.3.5 Sector Erase Abort Command

The sector erase abort operation will terminate the active sector erase or sector modify operation so that other sectors in an EEPROM block are available for read and program operations without waiting for the sector erase or sector modify operation to complete.

An example flow to execute the sector erase abort operation is shown in Figure 4-6. The sector erase abort command write sequence is as follows:

35

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