mc9s08gt32a Freescale Semiconductor, Inc, mc9s08gt32a Datasheet - Page 126

• Manufacturer Part Number: mc9s08gt32a
• Description: Hcs08 Microcontrollers 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

Internal Clock Generator (S08ICGV2)
7.5.6
126
Reset:
Reset
POR:
Field
Field
TRIM
FLT
7:0
7:0
W
W
R
R
ICG Trim Register (ICGTRM)
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.
ICG Trim Setting — The TRIM bits control the internal reference generator frequency. They allow a ± 25%
adjustment of the nominal (POR) period. The bit’s effect on period is binary weighted (i.e., bit 1 will adjust twice
as much as changing bit 0). Increasing the binary value in TRIM will increase the period and decreasing the value
will decrease the period.
1
1
u
7
7
= Unimplemented or Reserved
= Unimplemented or Reserved
1
0
u
6
6
Figure 7-17. ICG Upper Filter Register (ICGFLTL)
Figure 7-18. ICG Trim Register (ICGTRM)
Table 7-11. ICGFLTL Field Descriptions
Table 7-12. ICGTRM Field Descriptions
MC9S08GB60A Data Sheet, Rev. 1.02
0
0
u
5
5
0
0
u
4
4
Description
Description
TRIM
FLT
u = Unaffected by MCU reset
3
0
3
0
u
0
0
u
2
2
Freescale Semiconductor
0
0
u
1
1
0
0
u
0
0