mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 293
mc9s12xf512
Manufacturer Part Number
mc9s12xf512
Description
S12x Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XF512.pdf
(1306 pages)
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9.3.2.1
The FCLKDIV register is used to control timed events in program and erase algorithms.
All bits in the FCLKDIV register are readable, bits 6–0 are write once and bit 7 is not writable.
Freescale Semiconductor
FDIV[6:0]
FDIVLD
Address
Offset Module Base + 0x0000
Reset
& Name
Field
6–0
7
W
R
FDIVLD
Clock Divider Loaded
0 FCLKDIV register has not been written
1 FCLKDIV register has been written since the last reset
Clock Divider Bits — FDIV[6:0] must be set to effectively divide OSCCLK down to generate an internal Flash
clock, FCLK, with a target frequency of 1 MHz for use by the Flash module to control timed events during program
and erase algorithms.
Please refer to
Flash Clock Divider Register (FCLKDIV)
0
7
The FCLKDIV register should never be written while a Flash command is
executing (CCIF=0). The FCLKDIV register is writable during the Flash
reset sequence even though CCIF is clear.
= Unimplemented or Reserved
7
Section 9.4.1, “Flash Command Operations,”
0
Figure 9-4. FTM512K3 Register Summary (continued)
6
Figure 9-5. Flash Clock Divider Register (FCLKDIV)
= Unimplemented or Reserved
Table 9-9
MC9S12XF - Family Reference Manual, Rev.1.19
6
Table 9-8. FCLKDIV Field Descriptions
0
5
shows recommended values for FDIV[6:0] based on OSCCLK frequency.
5
CAUTION
0
4
Description
4
FDIV[6:0]
Chapter 9 512 KByte Flash Module (S12XFTM512K3V1)
0
3
for more information.
3
0
2
2
0
1
1
0
0
0
293
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