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Chapter 3 4 Kbyte EEPROM Module (S12XEETX4KV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 153
Table 3-7. ESTAT Field Descriptions
Field Description
7
CBEIF
Command Buffer Empty Interrupt Flag — The CBEIF flag indicates that the address, data, and command
buffers are empty so that a new command write sequence can be started. The CBEIF flag is cleared by writing
a 1 to CBEIF. Writing a 0 to the CBEIF flag has no effect on CBEIF. Writing a 0 to CBEIF after writing an aligned
word to the EEPROM address space but before CBEIF is cleared will abort a command write sequence and
cause the ACCERR flag to be set. Writing a 0 to CBEIF outside of a command write sequence will not set the
ACCERR flag. The CBEIF flag is used together with the CBEIE bit in the ECNFG register to generate an interrupt
request (see Figure 3-21).
0 Buffers are full.
1 Buffers are ready to accept a new command.
6
CCIF
Command Complete Interrupt Flag — The CCIF flag indicates that there are no more commands pending. The
CCIF flag is cleared when CBEIF is clear and sets automatically upon completion of all active and pending
commands. The CCIF flag does not set when an active commands completes and a pending command is
fetched from the command buffer. Writing to the CCIF flag has no effect on CCIF. The CCIF flag is used together
with the CCIE bit in the ECNFG register to generate an interrupt request (see Figure 3-21).
0 Command in progress.
1 All commands are completed.
5
PVIOL
Protection Violation Flag — The PVIOL flag indicates an attempt was made to program or erase an address
in a protected area of the EEPROM memory during a command write sequence. The PVIOL flag is cleared by
writing a 1 to PVIOL. Writing a 0 to the PVIOL flag has no effect on PVIOL. While PVIOL is set, it is not possible
to launch a command or start a command write sequence.
0 No failure.
1 A protection violation has occurred.
4
ACCERR
Access Error Flag — The ACCERR flag indicates an illegal access has occurred to the EEPROM memory
caused by either a violation of the command write sequence (see Section 3.4.1.2, “Command Write Sequence”),
issuing an illegal EEPROM command (see Table 3-9), launching the sector erase abort command terminating a
sector erase operation early (see Section 3.4.2.5, “Sector Erase Abort Command”) or the execution of a CPU
STOP instruction while a command is executing (CCIF = 0). The ACCERR flag is cleared by writing a 1 to
ACCERR. Writing a 0 to the ACCERR flag has no effect on ACCERR. While ACCERR is set, it is not possible to
launch a command or start a command write sequence. If ACCERR is set by an erase verify operation, any
buffered command will not launch.
0 No access error detected.
1 Access error has occurred.
2
BLANK
Flag Indicating the Erase Verify Operation Status — When the CCIF flag is set after completion of an erase
verify command, the BLANK flag indicates the result of the erase verify operation. The BLANK flag is cleared by
the EEPROM module when CBEIF is cleared as part of a new valid command write sequence. Writing to the
BLANK flag has no effect on BLANK.
0 EEPROM block verified as not erased.
1 EEPROM block verified as erased.
1
FAIL
Flag Indicating a Failed EEPROM Operation — The FAIL flag will set if the erase verify operation fails
(EEPROM block verified as not erased). The FAIL flag is cleared by writing a 1 to FAIL. Writing a 0 to the FAIL
flag has no effect on FAIL.
0 EEPROM operation completed without error.
1 EEPROM operation failed.