mc9s08sg4 Freescale Semiconductor, Inc, mc9s08sg4 Datasheet - Page 146
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mc9s08sg4
Manufacturer Part Number
mc9s08sg4
Description
8-bit Microcontroller Family
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08SG4.pdf
(320 pages)
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Part Number:
mc9s08sg4MTJG
Manufacturer:
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Chapter 10 Internal Clock Source (S08ICSV2)
10.1.4
There are seven modes of operation for the ICS: FEI, FEE, FBI, FBILP, FBE, FBELP, and stop.
10.1.4.1
In FLL engaged internal mode, which is the default mode, the ICS supplies a clock derived from the FLL
which is controlled by the internal reference clock. The BDC clock is supplied from the FLL.
10.1.4.2
In FLL engaged external mode, the ICS supplies a clock derived from the FLL which is controlled by an
external reference clock. The BDC clock is supplied from the FLL.
10.1.4.3
In FLL bypassed internal mode, the FLL is enabled and controlled by the internal reference clock, but is
bypassed. The ICS supplies a clock derived from the internal reference clock. The BDC clock is supplied
from the FLL.
146
Modes of Operation
FLL Engaged Interna
FLL Engaged External
FLL Bypassed Interna
RANGE
HGO
IREFS
Figure 10-2. Internal Clock Source (ICS) Block Diagram
External Reference
Clock Source
n=0-7
RDIV
Optional
/ 2
Block
n
MC9S08SG8 MCU Series Data Sheet, Rev. 3
IREFSTEN
EREFSTEN
Reference
Internal
RDIV_CLK
TRIM
Clock
EREFS
l (FEI)
9
l (FBI)
(FEE)
Filter
DCO
LP
FLL
ERCLKEN
IRCLKEN
9
Internal Clock Source Block
CLKS
DCOOUT
n=0-3
BDIV
/ 2
/ 2
n
ICSERCLK
ICSIRCLK
ICSOUT
ICSLCLK
ICSFFCLK
Freescale Semiconductor
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