DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 122

• Manufacturer Part Number: DEMO9S08EL32
• Description: BOARD DEMO FOR 9S08 EL MCU
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08EL32

• Contents: Evaluation Board
• Processor To Be Evaluated: MC9S08EL32
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 12 V
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08EL
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08EL32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Internal Clock Source (S08ICSV2)
8.3.3
8.3.4
122
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
1
7
7
0
0
0
Table 8-5. ICS Status and Control Register Field Descriptions
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
Figure 8-6. ICS Status and Control Register (ICSSC)
Table 8-4. ICS Trim Register Field Descriptions
U
0
0
0
0
6
6
Figure 8-5. ICS Trim Register (ICSTRM)
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