mcf51em256 Freescale Semiconductor, Inc, mcf51em256 Datasheet - Page 35

• Manufacturer Part Number: mcf51em256
• Description: Microcontrollers Covers Mcf51em256 Mcf51em128
• Manufacturer: Freescale Semiconductor, Inc

2.10
Freescale Semiconductor
Num
1
2
3
4
5
6
7
C
C
C
C
P
P Internal reference frequency — user trimmed
T Internal reference start-up time
P
P
P
P
P
Average internal reference frequency — factory trimmed
DCO output frequency range
— trimmed
DCO output frequency
Resolution of trimmed DCO output frequency at fixed voltage
and temperature (using FTRIM)
Resolution of trimmed DCO output frequency at fixed voltage
and temperature (not using FTRIM)
Internal Clock Source (ICS) Characteristics
Figure 11. Typical Crystal or Resonator Circuit: High Range and Low Range/High Gain
Table 17. ICS Frequency Specifications (Temperature Range = –40 to 85 °C Ambient)
Reference = 32768 Hz
at V
and DMX32 = 1
DD
= 3.6 V and temperature = 25 °C
Figure 12. Typical Crystal or Resonator Circuit: Low Range/Low Gain
2
MCF51EM256 Series ColdFire Microcontroller Data Sheet, Rev.3
2
Characteristic
Preliminary—Subject to Change Without Notice
C
1
EXTAL
EXTAL
Low range (DRS = 00)
Mid range (DRS = 01)
High range (DRS = 10)
Low range (DRS = 00)
Mid range (DRS = 01)
High range (DRS = 10)
Crystal or Resonator
Crystal or Resonator
XOSC
XOSC
R
F
f
Δf
Δf
dco_DMX32
Symbol
XTAL
XTAL
dco_res_t
dco_res_t
f
f
t
f
dco_u
int_ut
IRST
int_ft
R
S
C
2
31.25
Min
16
32
48
—
—
—
—
—
—
—
Typical
Electrical Characteristics
32.768
19.92
39.85
59.77
±0.1
±0.2
60
—
—
—
—
1
39.06
Max
±0.2
±0.4
100
20
40
60
—
—
—
—
%f
%f
Unit
MHz
MHz
kHz
kHz
μs
dco
dco
35