sc9s08mz16 Freescale Semiconductor, Inc, sc9s08mz16 Datasheet - Page 129

• Manufacturer Part Number: sc9s08mz16
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

8.4.1
Freescale Semiconductor
Reset
LOCRE
REFST
CLKST
LOCK
LOLS
Field
Field
RFD
2:0
7:6
3
5
4
3
W
R
ICG Status Register 1 (ICGS1)
Loss of Clock Reset Enable — The LOCRE bit determines how the system manages a loss of clock condition.
0
1
Reduced Frequency Divider — The RFD bits control the value of the divider following the clock select circuitry.
The value specified by the RFD bits establishes the division factor (R) applied to the selected output clock source.
Writes to the RFD bits will not take effect if a previous write is not complete.
000 Division factor = 1
001 Division factor = 2
010 Division factor = 4
011 Division factor = 8
100 Division factor = 16
101 Division factor = 32
110 Division factor = 64
111 Division factor = 128
Clock Mode Status — The CLKST bits indicate the current clock mode. The CLKST bits don’t update
immediately after a write to the CLKS bits due to internal synchronization between clock domains.
00 Self-clocked
01 FLL engaged, internal reference
10 FLL bypassed, external reference
11 FLL engaged, external reference
Reference Clock Status — The REFST bit indicates which clock reference is currently selected by the
Reference Select circuit.
0 External Clock selected.
1 Crystal/Resonator selected.
FLL Loss of Lock Status — The LOLS bit is a sticky indication of FLL lock status.
0 FLL has not unexpectedly lost lock since LOLS was last cleared.
1 FLL has unexpectedly lost lock since LOLS was last cleared, LOLRE determines action taken.FLL has
FLL Lock Status — The LOCK bit indicates whether the FLL has acquired lock. The LOCK bit is cleared in off,
self-clocked, and FLL bypassed modes.
0 FLL is currently unlocked.
1 FLL is currently locked.
0
7
unexpectedly lost lock since LOLS was last cleared, LOLRE determines action taken.
Generate an interrupt request on loss of clock.
Generate a reset request on loss of clock.
CLKST
= Unimplemented or Reserved
Table 8-2. ICGC2 Register Field Descriptions (continued)
0
6
Table 8-3. ICGS1 Register Field Descriptions
Figure 8-7. ICG Status Register 1 (ICGS1)
REFST
SC9S08MZ16 MCU Data Sheet, Rev. 1
0
5
LOLS
0
4
Description
Description
LOCK
3
0
LOCS
0
2
Internal Clock Generator (S08ICGV4)
ERCS
0
1
ICGIF
1
0
0
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