PC912XDP512F0MPVR datasheet(1160/1348 Pages) FREESCALE

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Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)

MC9S12XDP512 Data Sheet, Rev. 2.21

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CBEIF, PVIOL, and ACCERR are readable and writable, CCIF and BLANK are readable and not writable,

remaining bits read 0 and are not writable in normal mode. FAIL is readable and writable in special mode.

FAIL must be clear in special mode when starting a command write sequence.

Table 28-14. FSTAT 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. Writing a 0 to the CBEIF ﬂag has no

effect on CBEIF. Writing a 0 to CBEIF after writing an aligned word to the Flash 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 cleared by writing a 1 to

CBEIF. The CBEIF ﬂag is used together with the CBEIE bit in the FCNFG register to generate an interrupt

request (see Figure 28-32).

0 Command buffers are full.

1 Command 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 cleared 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 FCNFG register to generate an interrupt request (see Figure 28-32).

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 Flash memory during a command write sequence. Writing a 0 to the PVIOL ﬂag has no

effect on PVIOL. The PVIOL ﬂag is cleared by writing a 1 to PVIOL. While PVIOL is set, it is not possible to launch

a command or start a command write sequence.

0 No protection violation detected.

1 Protection violation has occurred.

ACCERR

Access Error Flag — The ACCERR ﬂag indicates an illegal access has occurred to the Flash memory caused

by either a violation of the command write sequence (see Section 28.4.1.2, “Command Write Sequence”),

issuing an illegal Flash command (see Table 28-16), launching the sector erase abort command terminating a

sector erase operation early (see Section 28.4.2.6, “Sector Erase Abort Command”) or the execution of a CPU

STOP instruction while a command is executing (CCIF = 0). Writing a 0 to the ACCERR ﬂag has no effect on

ACCERR. The ACCERR ﬂag is cleared by writing a 1 to 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 or a data

compress 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 Flash 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 Flash block veriﬁed as not erased.

1 Flash block veriﬁed as erased.

FAIL

Flag Indicating a Failed Flash Operation — The FAIL ﬂag will set if the erase verify operation fails (selected

Flash block veriﬁed as not erased). Writing a 0 to the FAIL ﬂag has no effect on FAIL. The FAIL ﬂag is cleared by

writing a 1 to FAIL.

0 Flash operation completed without error.

1 Flash operation failed.

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