MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 358

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

S12 Clock, Reset and Power Management Unit (S12CPMU)
358
IRCTRIM[9:0]
TCTRIM[4:0]
15-11
Field
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
9-0
IRC1M frequency (IRCCLK)
1.5MHz
600KHz
IRCTRIM[5:0]
1MHz
IRC1M temperature coefficient Trim Bits
Trim bits for the Temperature Coefficient (TC) of the IRC1M frequency.
Figure 10-26
temperature.
Figure 10-26
TCTRIM[4:0]=0x00000 or 0x10000).
IRC1M Frequency Trim Bits — Trim bits for Internal Reference Clock
After System Reset the factory programmed trim value is automatically loaded into these registers, resulting in a
Internal Reference Frequency f
The frequency trimming consists of two different trimming methods:
A rough trimming controlled by bits IRCTRIM[9:6] can be done with frequency leaps of about 6% in average.
A fine trimming controlled by the bits IRCTRIM[5:0] can be done with frequency leaps of about 0.3% (this
trimming determines the precision of the frequency setting of 0.15%, i.e. 0.3% is the distance between two
trimming values).
Figure 10-25
$000
shows the influence of the bits TCTRIM4:0] on the relationship between frequency and
shows an approximate TC variation, relative to the nominal TC of the IRC1M (i.e. for
shows the relationship between the trim bits and the resulting IRC1M frequency.
Figure 10-25. IRC1M Frequency Trimming Diagram
Table 10-22. CPMUIRCTRIMH/L Field Descriptions
MC9S12G Family Reference Manual,
IRC1M_TRIM
......
. See device electrical characteristics for value of f
IRCTRIM[9:6]
Description
Rev.1.01
Freescale Semiconductor
IRCTRIM[9:0]
IRC1M_TRIM
$3FF
.