mc9s08ac32 Freescale Semiconductor, Inc, mc9s08ac32 Datasheet - Page 186

• Manufacturer Part Number: mc9s08ac32
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 10 Internal Clock Generator (S08ICGV4)
10.6.4
In this example, the FLL will be used (in FEI mode) to multiply the internal 243 kHz (approximate)
reference clock up to 10.8 MHz to achieve 5.4 MHz bus frequency. This system will also use the trim
function to fine tune the frequency based on an external reference signal.
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
The clock scheme will be FLL engaged, internal (FEI). So
Solving for N / R gives:
A trim procedure will be required to hone the frequency to exactly 5.4 MHz. An example of the trim
procedure is shown in example #4.
The values needed in each register to set up the desired operation are:
ICGC1 = $28 (%00101000)
ICGC2 = $31 (%00110001)
ICGS1 = $xx
ICGS2 = $xx
ICGFLTLU/L = $xx
186
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; good idea to read this before performing time critical operations
Not used in this example
N / R = 10.8 MHz /(243/7 kHz * 64) = 4.86 ; We can choose N = 10 and R = 2.
Example #3: No External Crystal Connection, 5.4 MHz Bus
Frequency
HGO
RANGE
REFS
OSCSTEN 0
LOCD
LOLRE
LOCRE
f
ICGOUT
0
0
1
01
0
0
0
011 Sets the MFD multiplication factor to 10
0
001 Sets the RFD division factor to ÷2
= (f
Configures oscillator for low power
Configures oscillator for low-frequency range; FLL prescale factor is 64
Oscillator using crystal or resonator requested (bit is really a don’t care)
FLL engaged, internal reference clock mode
Disables the oscillator
Loss-of-clock enabled
Unimplemented or reserved, always reads zero
Generates an interrupt request on loss of lock
Generates an interrupt request on loss of clock
IRG
MC9S08AC60 Series Data Sheet, Rev. 2
/ 7) * P * N / R ; P = 64, f
IRG
= 243 kHz
Bus
).
Freescale Semiconductor
Eqn. 10-5
Eqn. 10-6