sc9s08mz16 Freescale Semiconductor, Inc, sc9s08mz16 Datasheet - Page 140

• Manufacturer Part Number: sc9s08mz16
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Internal Clock Generator (S08ICGV4)
8.6.2
In this example, the FLL will be used (in FEE mode) to multiply the external 32 kHz oscillator up to
8.38 MHz to achieve 4.19 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
The clock scheme will be FLL engaged, external (FEE). So
Solving for N / R gives:
The values needed in each register to set up the desired operation are:
ICGC1 = $38 (%00111000)
ICGC2 = $00 (%00000000)
ICGS1 = $xx
ICGS2 = $xx
140
MFD Value
Bit 7
Bit 6
Bit 5
Bits 4:3 CLKS
Bit 2
Bit 1
Bit 0
Bit 7
Bits 6:4 MFD
Bit 3
Bits 2:0 RFD
This is read only except for clearing interrupt flag
000
001
010
011
100
101
110
111
Example #1: External Crystal = 32 kHz, Bus Frequency = 4.19 MHz
HGO
RANGE
REFS
OSCSTEN 0
LOCD
LOLRE
LOCRE
N / R = 8.38 MHz /(32 kHz * 64) = 4; we can choose N = 4 and R =1
Multiplication Factor (N)
0
0
1
11
0
0
0
000 Sets the MFD multiplication factor to 4
0
000 Sets the RFD division factor to ÷1
f
ICGOUT
10
12
14
16
18
4
6
8
Configures oscillator for low power
Configures oscillator for low-frequency range; FLL prescale factor is 64
Oscillator using crystal or resonator is requested
FLL engaged, external reference clock mode
Oscillator disabled
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
Table 8-12. MFD and RFD Decode Table
= f
SC9S08MZ16 MCU Data Sheet, Rev. 1
ext
* P * N / R; P = 64, f
ext
RFD
000
001
010
011
100
101
110
111
= 32 kHz
Bus
).
Division Factor (R)
Freescale Semiconductor
÷128
÷16
÷32
÷64
÷1
÷2
÷4
÷8
Eqn. 8-1
Eqn. 8-2