Information

emission level is the value of the maximum measured emission, rounded up to the next whole number, from among the
measured orientations in each frequency range.
2. V
DD
= 3.3 V, T
A
= 25 °C, f
OSC
= 12 MHz (crystal), f
SYS
= 48 MHz, f
BUS
= 48MHz
3. Specified according to Annex D of IEC Standard 61967-2, Measurement of Radiated Emissions—TEM Cell and Wideband
TEM Cell Method
5.2.7 Designing with radiated emissions in mind
To find application notes that provide guidance on designing your system to minimize
interference from radiated emissions:
1. Go to http://www.freescale.com.
2. Perform a keyword search for “EMC design.”
5.2.8 Capacitance attributes
Table 8. Capacitance attributes
Symbol Description Min. Max. Unit
C
IN_A
Input capacitance: analog pins — 7 pF
C
IN_D
Input capacitance: digital pins — 7 pF
5.3 Switching specifications
5.3.1 Device clock specifications
Table 9. Device clock specifications
Symbol Description Min. Max. Unit Notes
Normal run mode
f
SYS
System and core clock — 50 MHz
f
SYS_USB
System and core clock when Full Speed USB in
operation
20 — MHz
f
BUS
Bus clock — 50 MHz
f
FLASH
Flash clock — 25 MHz
f
LPTMR
LPTMR clock — 25 MHz
VLPR mode
1
f
SYS
System and core clock — 4 MHz
f
BUS
Bus clock — 4 MHz
Table continues on the next page...
General
K20 Sub-Family Data Sheet, Rev. 4 5/2012.
Freescale Semiconductor, Inc. 19