MC9S08AW32CFGE Freescale, MC9S08AW32CFGE Datasheet - Page 151

• Manufacturer Part Number: MC9S08AW32CFGE
• Manufacturer: Freescale

Specifications of MC9S08AW32CFGE

• Cpu Family: HCS08
• Device Core Size: 8b
• Frequency (max): 40MHz
• Interface Type: I2C/SCI/SPI
• Total Internal Ram Size: 2KB
• # I/os (max): 34
• Number Of Timers - General Purpose: 8
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: LQFP
• Program Memory Type: Flash
• Program Memory Size: 32KB
• Lead Free Status / RoHS Status: Compliant

8.5.3
In this example, the FLL will be used (in FEE mode) to multiply the external 4 MHz oscillator up to
40-MHz to achieve 20 MHz bus frequency.
After the MCU is released from reset, the ICG is in self-clocked mode (SCM) and supplies approximately
8 MHz on ICGOUT which corresponds to a 4 MHz bus frequency (f
During reset initialization software, the clock scheme will be set to FLL engaged, external (FEE). So
Solving for N / R gives:
The values needed in each register to set up the desired operation are:
ICGC1 = $78 (%01111000)
ICGC2 = $30 (%00110000)
ICGS1 = $xx
ICGS2 = $xx
ICGFLTLU/L = $xx
ICGTRM
Freescale Semiconductor
Bit 7
Bit 6
Bit 5
Bits 4:3 CLKS
Bit 2
Bit 1
Bit 0
Bit 7
Bit 6:4 MFD
Bit 3
Bit 2:0 RFD
This is read only except for clearing interrupt flag
This is read only. Should read DCOS before performing any time critical tasks
Not used in this example
Not used in this example
Example #2: External Crystal = 4 MHz, Bus Frequency = 20 MHz
HGO
RANGE
REFS
OSCSTEN 0
LOCD
LOLRE
LOCRE
N / R = 40 MHz /(4 MHz * 1) = 10 ; We can choose N = 10 and R = 1
0
1
1
11
0
0
0
011 Sets the MFD multiplication factor to 10
0
000 Sets the RFD division factor to ÷1
f
ICGOUT
Configures oscillator for low power
Configures oscillator for high-frequency range; FLL prescale factor is 1
Requests an oscillator
FLL engaged, external reference clock mode
Disables the oscillator
Loss-of-clock detection enabled
Unimplemented or reserved, always reads zero
Generates an interrupt request on loss of lock
Generates an interrupt request on loss of clock
= f
ext
MC9S08AW60 Data Sheet, Rev 2
* P * N / R ; P = 1, f
ext
= 4.00 MHz
Chapter 8 Internal Clock Generator (S08ICGV4)
Bus
).
Eqn. 8-3
Eqn. 8-4
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