mc9s08dz32amlfr Freescale Semiconductor, Inc, mc9s08dz32amlfr Datasheet - Page 177

• Manufacturer Part Number: mc9s08dz32amlfr
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

8.3.6
Freescale Semiconductor
dco_select
DMX32
DRST
Field
DRS
7:6
4:1
5
0
Reset:
W
R
MCG Test and Control Register (MCGT)
Reserved for test, user code should not write 1’s to these bits.
DCO Maximum frequency with 32.768 kHz reference — The DMX32 bit controls whether or not the DCO
frequency range is narrowed to its maximum frequency with a 32.768 kHz reference. See
0 DCO has default range of 25%.
1 DCO is fined tuned for maximum frequency with 32.768 kHz reference.
Reserved for test, user code should not write 1’s to these bits.
DCO Range Status — The DRST read bit indicates the current frequency range for the FLL output, DCOOUT.
See
synchronization between clock domains. The DRST bit is not valid in BLPI, BLPE, PBE or PEE mode and it reads
zero regardless of the DCO range selected by the DRS bit.
DCO Range Select — The DRS bit selects the frequency range for the FLL output, DCOOUT. Writes to the DRS
bit while either the LP or PLLS bit is set are ignored.
0 Low range.
1 Mid range.
Table
1
7
0
0
DRS DMX32
The resulting bus clock frequency should not exceed the maximum specified bus
clock frequency of the device.
0
1
8-9. The DRST bit does not update immediately after a write to the DRS field due to internal
Table 8-8. MCG Test and Control Register Field Descriptions
Figure 8-8. MCG Test and Control Register (MCGT)
0
1
0
1
0
0
6
31.25 - 39.0625 kHz
31.25 - 39.0625 kHz
MC9S08DZ128 Series Data Sheet, Rev. 1
Reference range
Table 8-9. DCO frequency range
DMX32
0
5
32.768 kHz
32.768 kHz
0
0
4
Description
FLL factor
1024
1216
512
608
Chapter 8 Multi-Purpose Clock Generator (S08MCGV2)
0
0
3
1
0
0
2
DCO range
16 - 20 MHz
32 - 40 MHz
19.92 MHz
39.85 MHz
0
0
1
Table
8-9.
DRST
DRS
1
0
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