MC9S08AW16CFUE Datasheet, PDF (137/324 Pages) Freescale Semiconductor, Inc – MC9S08AW60 Features

8.3.2 ICG Control Register 2 (ICGC2)
Chapter 8 Internal Clock Generator (S08ICGV4)
7
6
5
4
3
2
1
0
R
LOLRE
W
MFD
LOCRE
RFD
Reset
0
0
0
0
0
0
0
0
Figure 8-7. ICG Control Register 2 (ICGC2)
Table 8-2. ICGC2 Register Field Descriptions
Field
7
LOLRE
6:4
MFD
3
LOCRE
2:0
RFD
Description
Loss of Lock Reset Enable — The LOLRE bit determines what type of request is made by the ICG following a
loss of lock indication. The LOLRE bit only has an effect when LOLS is set.
0 Generate an interrupt request on loss of lock.
1 Generate a reset request on loss of lock.
Multiplication Factor — The MFD bits control the programmable multiplication factor in the FLL loop. The value
specified by the MFD bits establishes the multiplication factor (N) applied to the reference frequency. Writes to
the MFD bits will not take effect if a previous write is not complete. Select a low enough value for N such that
f_ICGDCLK does not exceed its maximum specified value.
000 Multiplication factor = 4
001 Multiplication factor = 6
010 Multiplication factor = 8
011 Multiplication factor = 10
100 Multiplication factor = 12
101 Multiplication factor = 14
110 Multiplication factor = 16
111 Multiplication factor = 18
Loss of Clock Reset Enable — The LOCRE bit determines how the system manages a loss of clock condition.
0 Generate an interrupt request on loss of clock.
1 Generate a reset request on loss of clock.
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
MC9S08AW60 Data Sheet, Rev 2
Freescale Semiconductor
137