mc9s08ac32 Freescale Semiconductor, Inc, mc9s08ac32 Datasheet - Page 172

• Manufacturer Part Number: mc9s08ac32
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 10 Internal Clock Generator (S08ICGV4)
10.4.4
10.4.5
172
Reset
Reset
DCOS
Field
Field
FLT
3:0
0
W
W
R
R
ICG Status Register 2 (ICGS2)
ICG Filter Registers (ICGFLTU, ICGFLTL)
DCO Clock Stable — The DCOS bit is set when the DCO clock (ICG2DCLK) is stable, meaning the count error
has not changed by more than n
used when exiting off state if CLKS = X1 to determine when to switch to the requested clock mode. It is also used
in self-clocked mode to determine when to start monitoring the DCO clock. This bit is cleared upon entering the
off state.
0 DCO clock is unstable.
1 DCO clock is stable.
Filter Value — The FLT bits indicate the current filter value, which controls the DCO frequency. The FLT bits are
read only except when the CLKS bits are programmed to self-clocked mode (CLKS = 00). In self-clocked mode,
any write to ICGFLTU updates the current 12-bit filter value. Writes to the ICGFLTU register will not affect FLT if
a previous latch sequence is not complete.
0
0
0
0
7
7
= Unimplemented or Reserved
= Unimplemented or Reserved
0
0
0
0
6
6
Figure 10-10. ICG Upper Filter Register (ICGFLTU)
Table 10-5. ICGFLTU Register Field Descriptions
Table 10-4. ICGS2 Register Field Descriptions
Figure 10-9. ICG Status Register 2 (ICGS2)
MC9S08AC60 Series Data Sheet, Rev. 2
0
0
0
0
5
5
unlock
for two consecutive samples and the DCO clock is not static. This bit is
0
0
0
0
4
4
Description
Description
3
0
0
3
0
0
0
0
2
2
FLT
Freescale Semiconductor
0
0
0
1
1
DCOS
0
0
0
0