DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 123

• Manufacturer Part Number: DEMO9S08EL32
• Description: BOARD DEMO FOR 9S08 EL MCU
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08EL32

• Contents: Evaluation Board
• Processor To Be Evaluated: MC9S08EL32
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 12 V
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08EL
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08EL32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.4
8.4.1
The seven states of the ICS are shown as a state diagram and are described below. The arrows indicate the
allowed movements between the states.
8.4.1.1
FLL engaged internal (FEI) is the default mode of operation and is entered when all the following
conditions occur:
Freescale Semiconductor
FLL Bypassed
External Low
Power(FBELP)
Field
IREFS=0
CLKS=10
BDM Disabled
and LP=1
1
0
Functional Description
Operational Modes
OSC Initialization — If the external reference clock is selected by ERCLKEN or by the ICS being in FEE, FBE,
or FBELP mode, and if EREFS is set, then this bit is set after the initialization cycles of the external oscillator
clock have completed. This bit is only cleared when either ERCLKEN or EREFS are cleared.
ICS Fine Trim — The FTRIM bit controls the smallest adjustment of the internal reference clock frequency.
Setting FTRIM will increase the period and clearing FTRIM will decrease the period by the smallest amount
possible.
FLL Engaged Internal (FEI)
Entered from any state
when MCU enters stop
Table 8-5. ICS Status and Control Register Field Descriptions (continued)
IREFS=0
CLKS=10
BDM Enabled
or LP =0
FLL Bypassed
External (FBE)
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
Figure 8-7. Clock Switching Modes
FLL Engaged
External (FEE)
FLL Engaged
Internal (FEI)
IREFS=1
CLKS=00
IREFS=0
CLKS=00
Stop
Description
FLL Bypassed
Internal (FBI)
Returns to state that was active
before MCU entered stop, unless
RESET occurs while in stop.
IREFS=1
CLKS=01
BDM Enabled
or LP=0
Internal Clock Source (S08ICSV2)
FLL Bypassed
Internal Low
Power(FBILP)
IREFS=1
CLKS=01
BDM Disabled
and LP=1
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