MC9S08SG32E1JTGR FREESCALE [Freescale Semiconductor, Inc], MC9S08SG32E1JTGR Datasheet - Page 176

• Manufacturer Part Number: MC9S08SG32E1JTGR
• Description: HCS08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Chapter 11 Internal Clock Source (S08ICSV2)
11.3.3
11.3.4
176
IREFST
CLKST
Field
TRIM
Field
3-2
7:0
7:5
4
Reset:
Reset:
POR:
POR:
W
W
R
R
ICS Trim Register (ICSTRM)
ICS Status and Control (ICSSC)
ICS Trim Setting — The TRIM bits control the internal reference clock frequency by controlling the internal
reference clock period. The bits’ effect are binary weighted (i.e., bit 1 will adjust twice as much as bit 0).
Increasing the binary value in TRIM will increase the period, and decreasing the value will decrease the period.
An additional fine trim bit is available in ICSSC as the FTRIM bit.
Reserved, should be cleared.
Internal Reference Status — The IREFST bit indicates the current source for the reference clock. The IREFST
bit does not update immediately after a write to the IREFS bit due to internal synchronization between clock
domains.
0 Source of reference clock is external clock.
1 Source of reference clock is internal clock.
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
01
10
11
Output of FLL is selected.
FLL Bypassed, Internal reference clock is selected.
FLL Bypassed, External reference clock is selected.
Reserved.
U
7
1
7
0
0
0
Table 11-5. ICS Status and Control Register Field Descriptions
Figure 11-6. ICS Status and Control Register (ICSSC)
Table 11-4. ICS Trim Register Field Descriptions
U
0
0
0
0
6
6
Figure 11-5. ICS Trim Register (ICSTRM)
MC9S08SG32 Data Sheet, Rev. 7
U
0
0
0
0
5
5
IREFST
U
0
1
1
4
4
Description
Description
TRIM
U
0
0
0
3
3
CLKST
U
0
0
0
2
2
OSCINIT
Freescale Semiconductor
U
0
0
0
1
1
FTRIM
U
U
0
0
0
0