MM912H634CV1AE Freescale Semiconductor, MM912H634CV1AE Datasheet - Page 260

• Manufacturer Part Number: MM912H634CV1AE
• Description: 64KS12 LIN2xLS/HS Isense
• Manufacturer: Freescale Semiconductor
• Series: -r

Specifications of MM912H634CV1AE

• Applications: Automotive
• Core Processor: HCS12
• Program Memory Type: FLASH (64 kB)
• Controller Series: HCS12
• Ram Size: 6K x 8
• Interface: LIN
• Number Of I /o: -
• Voltage - Supply: 5.5 V ~ 27 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Freescale Semiconductor
IRCTRIM
TCTRIM
15-11
Field
9-0
IRC1M frequency (IRCCLK)
1.5 MHz
600 kHz
IRCTRIM[5:0]
IRC1M temperature coefficient Trim Bits
Trim bits for the Temperature Coefficient (TC) of the IRC1M frequency.
Figure 94
Figure 94
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 an 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 93
1.0 MHz
$000
shows the influence of the bits TCTRIM4:0] on the relationship between frequency and temperature.
shows an approximate TC variation, relative to the nominal TC of the IRC1M (i.e. for TCTRIM[4:0]=0x00000 or
shows the relationship between the trim bits and the resulting IRC1M frequency.
IRC1M_TRIM
Table 375. CPMUIRCTRIMH/L Field Descriptions
Figure 93. IRC1M Frequency Trimming Diagram
MM912_634 Advance Information, Rev. 4.0
. See device electrical characteristics for value of f
......
IRCTRIM[9:6]
Description
IRCTRIM[9:0]
IRC1M_TRIM
$3FF
.
$1FF
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