64 KByte Flash Module (S12FTMRG64K4KV2)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
447
18.3.2.1
Flash Clock Divider Register (FCLKDIV)
The FCLKDIV register is used to control timed events in program and erase algorithms.
All bits in the FCLKDIV register are readable, bit 7 is not writable, bit 6 is write-once-hi and controls the
writability of the FDIV field in normal mode. In special mode, bits 6-0 are writable any number of times
but bit 7 remains unwritable.
CAUTION
The FCLKDIV register should never be written while a Flash command is
executing (CCIF=0).
FRSV5
R
0
0
0
0
0
0
0
0
W
FRSV6
R
0
0
0
0
0
0
0
0
W
FRSV7
R
0
0
0
0
0
0
0
0
W
= Unimplemented or Reserved
7
6
5
4
3
2
1
0
R
FDIVLD
FDIVLCK
FDIV[5:0]
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 18-5. Flash Clock Divider Register (FCLKDIV)
Table 18-7. FCLKDIV Field Descriptions
Field
Description
7
FDIVLD
Clock Divider Loaded
0 FCLKDIV register has not been written since the last reset
1 FCLKDIV register has been written since the last reset
Address
& Name
7
6
5
4
3
2
1
0
Figure 18-4. FTMRG64K4K Register Summary (continued)
Summary of Contents for MC9S12VRP64
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