Peripheral operating requirements and behaviors
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
1
Δfdco_res_t Resolution of trimmed average DCO output
frequency at fixed voltage and temperature —
using SCTRIM only
—
0.2
0.5
—
%fdco
Δfdco_t
Total deviation of trimmed average DCO output
frequency over voltage and temperature
—
—
+0.5/-0.7
%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
ffll_ref
fdco
FLL reference frequency range
31.25
20
—
39.0625
25
kHz
DCO output
Low range (DRS=00)
640 × ffll_ref
20.97
MHz
2, 3
frequency range
Mid range (DRS=01)
1280 × ffll_ref
40
60
80
41.94
62.91
83.89
50
75
MHz
MHz
MHz
Mid-high range (DRS=10)
1920 × ffll_ref
High range (DRS=11)
2560 × ffll_ref
100
Table continues on the next page...
K51 Sub-Family Data Sheet, Rev. 2, 4/2012.
Freescale Semiconductor, Inc.
27
FREESCALE [ Freescale ]
