Chapter 27 512 Kbyte Flash Module (S12XFTX512K4V2)
MC9S12XDP512 Data Sheet, Rev. 2.17
1122
Freescale Semiconductor
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 27-16. FSTAT Field Descriptions
Field
Description
7
CBEIF
Command Buffer Empty Interrupt Flag — The CBEIF ag 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 ag 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 ag to be set. Writing a 0 to CBEIF
outside of a command write sequence will not set the ACCERR ag. The CBEIF ag is cleared by writing a 1 to
CBEIF. The CBEIF ag is used together with the CBEIE bit in the FCNFG register to generate an interrupt
0 Command buffers are full.
1 Command buffers are ready to accept a new command.
6
CCIF
Command Complete Interrupt Flag — The CCIF ag indicates that there are no more commands pending. The
CCIF ag is cleared when CBEIF is cleared and sets automatically upon completion of all active and pending
commands. The CCIF ag does not set when an active commands completes and a pending command is
fetched from the command buffer. Writing to the CCIF ag has no effect on CCIF. The CCIF ag is used together
with the CCIE bit in the FCNFG register to generate an interrupt request (see
Figure 27-32).0 Command in progress.
1 All commands are completed.
5
PVIOL
Protection Violation Flag —The PVIOL ag 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 ag has no
effect on PVIOL. The PVIOL ag 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.
4
ACCERR
Access Error Flag — The ACCERR ag indicates an illegal access has occurred to the Flash memory caused
issuing an illegal Flash command (see
Table 27-18), launching the sector erase abort command terminating a
STOP instruction while a command is executing (CCIF = 0). Writing a 0 to the ACCERR ag has no effect on
ACCERR. The ACCERR ag 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.
2
BLANK
Flag Indicating the Erase Verify Operation Status — When the CCIF ag is set after completion of an erase
verify command, the BLANK ag indicates the result of the erase verify operation. The BLANK ag is cleared by
the Flash module when CBEIF is cleared as part of a new valid command write sequence. Writing to the BLANK
ag has no effect on BLANK.
0 Flash block veried as not erased.
1 Flash block veried as erased.
1
FAIL
Flag Indicating a Failed Flash Operation — The FAIL ag will set if the erase verify operation fails (selected
Flash block veried as not erased). Writing a 0 to the FAIL ag has no effect on FAIL. The FAIL ag is cleared by
writing a 1 to FAIL.
0 Flash operation completed without error.
1 Flash operation failed.