DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 115
![BOARD DEMO FOR 9S08 EL MCU](/photos/9/23/92304/demo9s08el32_sml.jpg)
DEMO9S08EL32
Manufacturer Part Number
DEMO9S08EL32
Description
BOARD DEMO FOR 9S08 EL MCU
Manufacturer
Freescale Semiconductor
Type
MCUr
Datasheets
1.DEMO9S08EL32.pdf
(356 pages)
2.DEMO9S08EL32.pdf
(14 pages)
3.DEMO9S08EL32.pdf
(2 pages)
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
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Chapter 8
Internal Clock Source (S08ICSV2)
8.1
The internal clock source (ICS) module provides clock source choices for the MCU. The module contains
a frequency-locked loop (FLL) as a clock source that is controllable by either an internal or an external
reference clock. The module can provide this FLL clock or either of the internal or external reference
clocks as a source for the MCU system clock. There are also signals provided to control a low power
oscillator (XOSC) module to allow the use of an external crystal/resonator as the external reference clock.
Whichever clock source is chosen, it is passed through a reduced bus divider (BDIV) which allows a lower
final output clock frequency to be derived.
The bus frequency is half of the ICSOUT frequency. After reset, the ICS is configured for FEI mode and
BDIV resets to 01 to introduce an extra divide-by-two before ICSOUT. Therefore, the bus frequency is
f
is f
8.1.1
When the internal reference is enabled in stop mode (IREFSTEN = 1), the voltage regulator must also be
enabled in stop mode by setting the LVDE and LVDSE bits in the SPMSC1 register.
Figure 8-1
Freescale Semiconductor
dco
dco_ut
/4. At POR, the TRIM and FTRIM are reset to 0x80 and 0, respectively. Therefore, the dco frequency
. For other resets, the trim settings keep the value that was present before the reset.
Introduction
shows the MC9S08EL32 block diagram with the ICS highlighted.
Module Configuration
Refer to
distribution of clock sources throughout the MCU.
Section 1.3, “System Clock
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
NOTE
Distribution”,
for a detailed view of the
115
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