PC912XDP512F0MPVR datasheet(1046/1348 Pages) FREESCALE

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Chapter 25 2 Kbyte EEPROM Module (S12XEETX2KV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

1048

Freescale Semiconductor

Table 25-6. ESTAT Field Descriptions

Field

Description

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 25-24).

0 Buffers are full.

1 Buffers are ready to accept a new command.

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 25-24).

0 Command in progress.

1 All commands are completed.

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.

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 25.4.1.2, “Command Write

Sequence”), issuing an illegal EEPROM command (see Table 25-8), launching the sector erase abort command

terminating a sector erase operation early (see Section 25.4.2.5, “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.

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.

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.

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