Texas Instruments MSP430x1xx User Manual page 150

Flash Memory Registers
FCTL3, Flash Memory Control Register FCTL3
15 14
7 6
Reserved Reserved
r0 r0
FWKEYx Bits FCTLx password. Always read as 096h. Must be written as 0A5h or a PUC
15-8 will be generated.
Reserved Bits Reserved. Always read as 0.
7-6
EMEX Bit 5 Emergency exit
0
1
LOCK Bit 4 Lock. This bit unlocks the flash memory for writing or erasing. The LOCK bit
can be set anytime during a byte/word write or erase operation and the
operation will complete normally. In the block write mode if the LOCK bit is set
while BLKWRT=WAIT=1, then BLKWRT and WAIT are reset and the mode
ends normally.
0
1
WAIT Bit 3 Wait. Indicates the flash memory is being written to.
0
1
ACCVIFG Bit 2 Access violation interrupt flag
0
1
KEYV Bit 1 Flash security key violation. This bit indicates an incorrect FCTLx password
was written to any flash control register and generates a PUC when set. KEYV
must be reset with software.
0
1
BUSY Bit 0 Busy. This bit indicates the status of the flash timing generator.
0
1
5-20
Flash Memory Controller
13 12 11
FWKEYx, Read as 096h
Must be written as 0A5h
5 4
EMEX LOCK WAIT
rw-0 rw-1 r-1
No emergency exit
Emergency exit
Unlocked
Locked
The flash memory is not ready for the next byte/word write
The flash memory is ready for the next byte/word write
No interrupt pending
Interrupt pending
FCTLx password was written correctly
FCTLx password was written incorrectly
Not Busy
Busy
10 9
3 2 1
ACCVIFG KEYV
rw−0 rw-(0)
8
0
BUSY
r(w)−0