Infineon XMC7000 Series User manual

Application note
Please read the sections “Important notice” and “Warnings” at the end of this document
002-34390 Rev. *A
www.infineon.com
2023-06-05
AN234390
XMC7000: Setting the Clock Supervision (CSV)
parameters
About this document
Scope and purpose
The Clock Supervision (CSV) feature in the XMC7000 family enables you to check the frequency of the
monitored clock to ensure that it is within the allowed frequency window. To understand the functionality
described and terminology used in this guide, see the “Clocking system”chapter in the Architecture Technical
Reference Manual (TRM).
This guide describes how to calculate and set the CSV parameters using the CSV calculator.
Intended audience
This document is intended for anyone using the XMC7000 family to determine the CSV parameters.
Associated part family
XMC7000 family of XMC™ industrial microcontrollers

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XMC7000: Setting the Clock Supervision (CSV) parameters
Table of contents
Table of contents
About this document....................................................................................................................... 1
Table of contents............................................................................................................................ 2
1Overview............................................................................................................................... 3
2Parameters related to CSV ...................................................................................................... 4
2.1 Check the clock specifications................................................................................................................4
2.2 Determine the target...............................................................................................................................5
2.3 Calculate the lower and upper limit.......................................................................................................6
2.4 Calculate the period................................................................................................................................6
2.5 Calculate the startup delay.....................................................................................................................6
2.6 Check the values for CSV register settings .............................................................................................7
3CSV calculator examples ......................................................................................................... 8
3.1 PLL200 .....................................................................................................................................................8
3.2 PLL400 example ......................................................................................................................................9
3.3 FLL example...........................................................................................................................................10
References....................................................................................................................................12
Revision history.............................................................................................................................13
Disclaimer.....................................................................................................................................14

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XMC7000: Setting the Clock Supervision (CSV) parameters
Overview
1Overview
Figure 1 shows the signal example of the CSV.
Monitored Clock
Reference Clock
Period
Upper Limit
Lower Limit
Monitor Event
Lower Limit
Upper Limit
the allowed frequency window
Target
Figure 1 CSV operation signal example
The basic operation principle of the CSV circuit is as follows:
•Period is the monitored clock count while ‘target’is the reference clock count. In an ideal case, the period
value and the target value are same.
•The monitored clock generates a monitor event (period), and the reference clock generates lower and upper
limits.
•The monitor event is compared against the lower and upper limits.
•An error is reported if the monitor event ≤Lower limit, or monitor event > upper limit.
The CLK_HF0 CSV must use the reset because the fault structure runs on CLK_HF0.

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XMC7000: Setting the Clock Supervision (CSV) parameters
Parameters related to CSV
2Parameters related to CSV
2.1 Check the clock specifications
Check the following clock specifications:
•Reference clock frequency and tolerance (integer %)
•Monitored clock frequency and required tolerance (integer %)
The required monitored clock tolerance should be equal to or larger than the reference clock tolerance.
−In case if the monitored clock is FLL, PLL200, or PLL400, set the nominal frequency (Fc) of configured VCO
or PLL400 output for fractional mode, or SSCG in down spread mode to the monitor clock frequency. See
SID341/SID341A(4)/SID341B(4)/SID351 in the device datasheet for the maximum frequency.
The maximum frequency is reduced in PLL400 with SSCG/fractional mode.
−If the monitored clock is PLL200 or PLL400 without SSCG/fractional mode, set ‘3 or more’ in
consideration of the PLL jitter to monitored clock tolerance.
−If the monitored clock is PLL400 with SSCG/fractional mode, set ‘5 or more’ in consideration of the PLL
jitter to monitored clock tolerance as shown in Figure 2.
−If the monitored clock is PLL400 with SSCG mode, set the modulation depth according to your
configuration.
Time
Modulation rate
( 1/ Modulation_frequency)
Frequency
Fc Jitter
Modulation
depth(ΔF)
Fc: Nominal frequency of configured VCO orPLL400 output for SSCG in downspread mode
Figure 2 PLL clock frequency tolerance
•Maximum startup time for the monitored clock except for WCO.
In the case of WCO, the startup time is unused (0). CSV should be enabled after WCO is started
(BACKUP_STATUS.WCO_OK = 1).
In the CSV calculator, enter the values given in the column highlighted in orange in Table 1. If the monitored
clock tolerance is smaller than the reference clock tolerance, the ‘Value’ cell of the monitored clock tolerance
will be highlighted in red.

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XMC7000: Setting the Clock Supervision (CSV) parameters
Parameters related to CSV
Table 1 Clock specification parameters
Parameters
Value
Unit
Remarks
Reference clock frequency
8000000
Hz
Nominal source clock frequency
ILO: 32768 (SID320)
IMO: 8000000 (SID310)
Reference clock tolerance
1
%
ILO: SID320
IMO: SID310
Monitored clock frequency
50000000
Hz
Nominal frequency, see
SID341/SID341A(4)/SID341B(4)/SID351
in the device datasheet
Monitored clock tolerance
3
%
≥Reference clock tolerance
(SID310/SID320)
Minimum: 3 (when the Monitored
clock is PLL200/400 without
SSCG/fractional mode)
Minimum: 5 (when the Monitored
clock is PLL400 with SSCG/fractional
mode)
Monitored clock tolerance (modulation
depth)
0
%
Maximum: 3 (only for PLL400 with
SSCG mode)
0 (others)
Maximum startup time for monitored
clock
35
μs
ILO: 12 (SID321)
IMO: 7.5 (SID311)
PLL200: 35 (SID340)
PLL400: 50 (SID340A)
FLL: 5 (SID350)
WCO: 0 (Unused)
2.2 Determine the target
Check the minimum target with Equation 1 using the CSV calculator.
For example, for a tolerance of one percent, the target must be at least 200. Increasing the target increases the
CSV accuracy; it also increases the latency.
Equation 1
  

Determine and enter the target value shown in the cell highlighted in orange(Table 2) in the CSV calculator. The
target should be greater or equal to the minimum target. If the target is smaller than the minimum target, the
‘Value’ cell of the target will be highlighted in red.

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XMC7000: Setting the Clock Supervision (CSV) parameters
Parameters related to CSV
Table 2 Target parameters
Parameters
Value
Unit
Remarks
Minimum target (Calculated reference clock count)
200
Cycles
Target (Reference clock count for user definition)
200
Cycles
≥Minimum target
2.3 Calculate the lower and upper limit
Calculate the lower limit with Equation 2 using the CSV calculator.
Equation 2
    
 
󰇡
 󰇢
Calculate the Upper limit with Equation 3 using the CSV calculator.
Equation 3
   
 
󰇡
 󰇢
Only for PLL400 SSCG mode:
    
 
󰇡
 󰇢
2.4 Calculate the period
Calculate the period with Equation 4 using the CSV calculator. If the period value is less than one, increase the
target value. To avoid the round-off error of the period value, the value should be as close to an integral value
as possible and not a decimal value. This can be achieved by adjusting the target value.
Equation 4
  

2.5 Calculate the startup delay
Calculate the Startup Delay with Equation 5 using the CSV calculator. In the case of WCO, the startup time is
unused (0). CSV should be enabled after WCO is started (BACKUP_STATUS.WCO_OK = 1).
Equation 5
  󰇛

 󰇜

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XMC7000: Setting the Clock Supervision (CSV) parameters
Parameters related to CSV
2.6 Check the values for CSV register settings
You should set the values obtained by subtracting 1 from the above-calculated values in the CSV register. The
CSV calculator calculates these CSV register values based on the above parameters and automatically displays
the values that are shown in the column highlighted in green. If the value is larger than 65535, the cell will be
highlighted in red.
When determining the final CSV parameters, evaluate the CSV function sufficiently in the user system
environment.
Table 3 Parameters for CSV registers
Parameters
Value
Unit
Remarks
Upper limit value for UPPER register
204
Cycles
Maximum: 255 (Only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Lower limit value for LOWER register
195
Cycles
Maximum: 255 (Only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Period value for PERIOD register
1249
Cycles
Minimum: 0
Maximum: 255 (Only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Startup delay value for STARTUP
register
282
Cycles
Maximum: 255 (Only for CSV_ILO/LF)
Maximum: 65535 (Others)

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XMC7000: Setting the Clock Supervision (CSV) parameters
CSV calculator examples
3CSV calculator examples
3.1 PLL200
An example of the PLL200 CSV calculator is demonstrated in this section with the following parameters:
•Reference clock frequency: 8 MHz (ECO)
•Reference clock tolerance: 1 % (ECO)
•Target: 200 (use the same value as the calculated minimum target)
•Monitored clock frequency: 50 MHz (CSV_HF0/PLL200)
•Monitored clock tolerance: 3 % (CSV_HF0/PLL200)
•Monitored clock tolerance (modulation depth): 0% (CSV_HF0/PLL200)
•Startup time for Monitored clock: 35 (PLL200)
In the CSV calculator, enter the values given in cells highlighted in orange in Table 4.
Table 4 Input parameters
Parameters
Value
Unit
Remarks
Reference clock frequency
8000000
Hz
Nominal source clock
frequency
ILO: 32768 (SID320)
IMO: 8000000 (SID310)
Reference clock tolerance
1
%
ILO: SID320
IMO: SID310
Minimum target (calculated reference clock count)
200
Cycles
Target (reference clock count for user definition)
200
Cycles
≥Minimum target
Monitored clock frequency
50000000
Hz
Nominal frequency
Monitored clock tolerance
3
%
≥Reference clock tolerance
(SID310/SID320)
Minimum: 3 (when the
monitored clock is
PLL200/400 without
SSCG/fractional mode)
Minimum: 5 (when the
monitored clock is PLL400
with SSCG/fractional mode)
Monitored clock tolerance (modulation depth)
0
%
Maximum: 3 (only for PLL400
with SSCG mode)
0 (others)
Maximum startup time for monitored clock
35
μs
ILO: 12 (SID321)
IMO: 7.5 (SID311)
PLL200: 35 (SID340)
PLL400: 50 (SID340A)
FLL: 5 (SID350)
WCO: 0 (unused)

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XMC7000: Setting the Clock Supervision (CSV) parameters
CSV calculator examples
The CSV calculator calculates the CSV register values based on the entered parameters and automatically
displays the values shown in the column highlighted in green in Table 5.
Table 5 Output parameters
Parameters
Value
Unit
Remarks
Upper limit value for UPPER register
208
Cycles
Maximum: 255 (Only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Lower limit value for LOWER register
192
Cycles
Maximum: 255 (Only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Period value for PERIOD register
1250
Cycles
Minimum: 0
Maximum: 255 (Only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Startup delay value for STARTUP
register
283
Cycles
Maximum: 255 (Only for CSV_ILO/LF)
Maximum: 65535 (Others)
3.2 PLL400 example
An example of the PLL400 CSV calculator is demonstrated in this section with the following parameters:
•Reference clock frequency: 8 MHz (ECO)
•Reference clock tolerance: 1 % (ECO)
•Target: 400 (use twice the value of the calculated minimum target)
•Monitored clock frequency: 200 MHz (CSV_HF1/PLL400 with SSCG)
•Monitored clock tolerance: 5 % (CSV_HF1/PLL400 with SSCG)
•Monitored clock tolerance (modulation depth): 3 %
•Startup time for Monitored clock: 50 (PLL400)
In the CSV calculator, enter the values given in cells highlighted in orange in Table 6
Table 6 Input parameters
Parameters
Value
Unit
Remarks
Reference clock frequency
8000000
Hz
Nominal source clock
frequency
ILO: 32768 (SID320)
IMO: 8000000 (SID310)
Reference clock tolerance
1
%
ILO: SID320
IMO: SID310
Minimum target (calculated reference clock count)
200
Cycles
Target (reference clock count for user definition)
400
Cycles
≥Minimum target
Monitored clock frequency
200000000
Hz
Nominal frequency
Monitored clock tolerance
5
%
≥Reference clock tolerance
(SID310/SID320)
Minimum: 3 (when the
monitored clock is

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XMC7000: Setting the Clock Supervision (CSV) parameters
CSV calculator examples
Parameters
Value
Unit
Remarks
PLL200/400 without
SSCG/fractional mode)
Minimum: 5 (when the
monitored clock is PLL400
with SSCG/fractional mode)
Monitored clock tolerance (modulation depth)
3
%
Maximum: 3 (only for PLL400
SSCG mode)
0 (others)
Maximum startup time for monitored clock
50
μs
ILO: 12 (SID321)
IMO: 7.5 (SID311)
PLL200: 35 (SID340)
PLL400: 50 (SID340A)
FLL: 5 (SID350)
WCO: 0 (unused)
The CSV calculator calculates the CSV register values based on the entered parameters and automatically
displays the values shown in the column highlighted in green in Table 7.
Table 7 Output parameters
Parameters
Value
Unit
Remarks
Upper limit value for UPPER register
439
Cycles
Maximum: 255 (only for CSV_ILO/LF/BAK)
Maximum: 65535 (others)
Lower limit value for LOWER register
377
Cycles
Maximum: 255 (only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Period value for PERIOD register
10000
Cycles
Minimum: 0
Maximum: 255 (only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Startup delay value for STARTUP
register
404
Cycles
Maximum: 255 (only for CSV_ILO/LF)
Maximum: 65535 (others)
3.3 FLL example
An example of the FLL CSV calculator is demonstrated in this section with the following parameters:
•Reference clock frequency: 8 MHz (IMO)
•Reference clock tolerance: 4 % (IMO)
•Target: 50 (use the same value as the calculated minimum target)
•Monitored clock frequency: 100 MHz (CSV_HF0/FLL)
•Monitored clock tolerance: 5 % (Reference clock tolerance + SID352)
•Monitored clock tolerance (modulation depth): 0 % (CSV_HF0/FLL)
•Startup time for Monitored clock: 5 (FLL)
In the CSV calculator, enter the values given in cells highlighted in orange in Table 8

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CSV calculator examples
Table 8 Input parameters
Parameters
Value
Unit
Remarks
Reference clock frequency
8000000
Hz
Nominal source clock
frequency
ILO: 32768 (SID320)
IMO: 8000000 (SID310)
Reference clock tolerance
4
%
ILO: SID320
IMO: SID310
Minimum target (calculated reference clock count)
50
Cycles
Target (reference clock count for user definition)
50
Cycles
≥Minimum target
Monitored clock frequency
100000000
Hz
Nominal frequency
Monitored clock tolerance
4
%
≥Reference clock tolerance
(SID310/SID320)
Minimum: 3 (when the
monitored clock is PLL200/400
without SSCG/fractional mode)
Minimum: 5 (when the
monitored clock is PLL400 with
SSCG/fractional mode)
Monitored clock tolerance (modulation depth)
0
%
Maximum: 3 (only for PLL400
SSCG mode)
0 (others)
Maximum startup time for monitored clock
5
μs
ILO: 12 (SID321)
IMO: 7.5 (SID311)
PLL200: 35 (SID340)
PLL400: 50 (SID340A)
FLL: 5 (SID350)
WCO: 0 (unused)
The CSV calculator calculates the CSV register values based on the entered parameters and automatically
displays the values shown in the column highlighted in green in Table 9.
Table 9 Output parameters
Parameters
Value
Unit
Remarks
Upper limit value for UPPER register
54
Cycles
Maximum: 255 (only for CSV_ILO/LF/BAK)
Maximum: 65535 (others)
Lower limit value for LOWER register
46
Cycles
Maximum: 255 (only for CSV_ILO/LF/BAK)
Maximum: 65535 (others)
Period value for PERIOD register
625
Cycles
Minimum: 0
Maximum: 255 (only for CSV_ILO/LF/BAK)
Maximum: 65535 (Others)
Startup delay value for STARTUP register
42
Cycles
Maximum: 255 (only for CSV_ILO/LF)
Maximum: 65535 (others)

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XMC7000: Setting the Clock Supervision (CSV) parameters
References
References
[1] Device datasheets:
•XMC7100 series 32-bit Arm® Cortex®-M7 microcontroller datasheet
•XMC7200 series 32-bit Arm® Cortex®-M7 microcontroller datasheet
[2] Device architecture TRM:
•XMC7000 MCU family architecture technical reference manual
Contact Technical support to obtain XMC7000 family references documents.

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Revision history
Revision history
Document
revision
Date
Description of changes
**
2021-12-06
Initial release.
*A
2023-06-05
Updated the description in section 2.1 and 2.3.
Updated the remarks in Table 1 and Table 3.
Updated section 3.
Added the References section.

Important notice
Warnings
Edition 2023-06-05
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2023 Infineon Technologies AG.
All Rights Reserved.
Do you have a question about this
document?
Email: [e-mail]
Document reference
002-34390 Rev. *A
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