K20P81M72SF1 Datasheet, PDF (26/74 Pages) Freescale Semiconductor, Inc – K20 Sub-Family

Peripheral operating requirements and behaviors
6.3.1 MCG specifications
Table 13. MCG specifications
Symbol Description
Min.
f_{ints_ft} Internal reference frequency (slow clock) —
—
factory trimmed at nominal VDD and 25 °C
f_{ints_t}
Internal reference frequency (slow clock) — user
trimmed
31.25
Δ_{fdco_res_t} Resolution of trimmed average DCO output
—
frequency at fixed voltage and temperature —
using SCTRIM and SCFTRIM
Δf_{dco_res_t} Resolution of trimmed average DCO output
—
frequency at fixed voltage and temperature —
using SCTRIM only
Δf_{dco_t} Total deviation of trimmed average DCO output
—
frequency over voltage and temperature
Δf_{dco_t} Total deviation of trimmed average DCO output
—
frequency over fixed voltage and temperature
range of 0–70°C
f_{intf_ft} Internal reference frequency (fast clock) —
—
factory trimmed at nominal VDD and 25°C
f_{intf_t} Internal reference frequency (fast clock) — user
3
trimmed at nominal VDD and 25 °C
f_{loc_low}
Loss of external clock minimum frequency —
RANGE = 00
(3/5) x
f_{ints_t}
f_{loc_high} Loss of external clock minimum frequency —
RANGE = 01, 10, or 11
(16/5) x
f_{ints_t}
FLL
f_{fll_ref} FLL reference frequency range
31.25
f_dco
DCO output
Low range (DRS=00)
20
frequency range
640 × f_{fll_ref}
Mid range (DRS=01)
40
1280 × f_{fll_ref}
Mid-high range (DRS=10)
60
1920 × f_{fll_ref}
High range (DRS=11)
80
2560 × f_{fll_ref}
Typ.
32.768
—
± 0.3
± 0.2
+0.5/-0.7
4
—
—
—
—
20.97
41.94
62.91
83.89
Table continues on the next page...
Max.
—
39.0625
± 0.6
± 0.5
—
—
5
—
—
39.0625
25
50
75
100
Unit
kHz
kHz
%f_dco
%f_dco
%f_dco
%f_dco
MHz
MHz
kHz
kHz
kHz
MHz
MHz
MHz
MHz
Notes
1
1
1
1
2, 3
K20 Sub-Family Data Sheet, Rev. 2, 4/2012.
26
Freescale Semiconductor, Inc.