S9S08DZ60F2MLF Freescale Semiconductor, S9S08DZ60F2MLF Datasheet - Page 164
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S9S08DZ60F2MLF
Manufacturer Part Number
S9S08DZ60F2MLF
Description
8-bit Microcontrollers - MCU M74K MASK ONLY-AUTO
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S08DZ60F2MLH.pdf
(416 pages)
Specifications of S9S08DZ60F2MLF
Rohs
yes
Core
HCS08
Data Bus Width
8 bit
Maximum Clock Frequency
40 MHz
Program Memory Size
60 KB
Data Ram Size
4 K
On-chip Adc
Yes
Operating Supply Voltage
2.7 V to 5.5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
LQFP-48
Mounting Style
SMD/SMT
Processor Series
MC9S08DZ60
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Chapter 8 Multi-Purpose Clock Generator (S08MCGV1)
8.5.3
Calibrating the Internal Reference Clock (IRC)
The IRC is calibrated by writing to the MCGTRM register first, then using the FTRIM bit to “fine tune”
the frequency. We will refer to this total 9-bit value as the trim value, ranging from 0x000 to 0x1FF, where
the FTRIM bit is the LSB.
The trim value after a POR is always 0x100 (MCGTRM = 0x80 and FTRIM = 0). Writing a larger value
will decrease the frequency and smaller values will increase the frequency. The trim value is linear with
the period, except that slight variations in wafer fab processing produce slight non-linearities between trim
value and period. These non-linearities are why an iterative trimming approach to search for the best trim
value is recommended. In Example #5: Internal Reference Clock Trim this approach will be demonstrated.
After a trim value has been found for a device, this value can be stored in FLASH memory to save the
value. If power is removed from the device, the IRC can easily be re-trimmed by copying the saved value
from FLASH to the MCG registers. Freescale identifies recommended FLASH locations for storing the
trim value for each MCU. Consult the memory map in the data sheet for these locations. On devices that
are factory trimmed, the factory trim value will be stored in these locations.
8.5.3.1
Example #5: Internal Reference Clock Trim
For applications that require a tight frequency tolerance, a trimming procedure is provided that will allow
a very accurate internal clock source. This section outlines one example of trimming the internal oscillator.
Many other possible trimming procedures are valid and can be used.
In the example below, the MCG trim will be calibrated for the 9-bit MCGTRM and FTRIM collective
value. This value will be referred to as TRMVAL.
MC9S08DZ60 Series Data Sheet, Rev. 4
164
Freescale Semiconductor
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