Peripheral operating requirements and behaviors
TCLK
TRST
J14
J13
Figure 7. TRST timing
6.2 System modules
There are no specifications necessary for the device's system modules.
6.3 Clock modules
6.3.1 MCG specifications
Table 13. MCG specifications
Symbol Description
Min.
Typ.
Max.
Unit
Notes
fints_ft Internal reference frequency (slow clock) —
—
32.768
—
kHz
factory trimmed at nominal VDD and 25 °C
fints_t
Internal reference frequency (slow clock) — user
trimmed
31.25
—
—
39.0625
0.6
kHz
Δfdco_res_t Resolution of trimmed average DCO output
frequency at fixed voltage and temperature —
using SCTRIM and SCFTRIM
0.3
%fdco
1
Δfdco_t
Total deviation of trimmed average DCO output
frequency over voltage and temperature
—
—
+0.5/-0.7
0.3
3
%fdco
%fdco
1
1
Δfdco_t
Total deviation of trimmed average DCO output
frequency over fixed voltage and temperature
range of 0–70°C
—
fintf_ft
Internal reference frequency (fast clock) —
factory trimmed at nominal VDD and 25°C
—
3
4
—
5
MHz
MHz
kHz
kHz
fintf_t
Internal reference frequency (fast clock) — user
trimmed at nominal VDD and 25 °C
—
—
—
floc_low
Loss of external clock minimum frequency —
RANGE = 00
(3/5) x
fints_t
—
—
floc_high
Loss of external clock minimum frequency —
RANGE = 01, 10, or 11
(16/5) x
fints_t
FLL
Table continues on the next page...
K20 Sub-Family Data Sheet, Rev. 4 5/2012.
Freescale Semiconductor, Inc.
25
FREESCALE [ Freescale ]
