mcf51em256 Freescale Semiconductor, Inc, mcf51em256 Datasheet - Page 34

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

Electrical Characteristics
2.9
Reference
low range mode. XOSC2 operates in all the power and range modes.
34
1
2
3
4
Num
Data in Typical column was characterized at 3.0 V, 25 °C or is typical recommended value.
Load capacitors (C
See crystal or resonator manufacturer’s recommendation.
Proper PC board layout procedures must be followed to achieve specifications.
1
2
3
4
5
6
C
C
D
D
D
D
T
External Oscillator (XOSC) Characteristics
Oscillator crystal or resonator (EREFS = 1, ERCLKEN = 1)
Load capacitors
Feedback resistor
Series resistor —
Crystal start-up time
Square wave input clock frequency (EREFS = 0, ERCLKEN = 1)
Figure 11
Low range, low power (RANGE = 0, HGO = 0)
Low range, high gain (RANGE = 0, HGO = 1)
High range, low power (RANGE = 1, HGO = 0)
High range, high gain (RANGE = 1, HGO = 1)
Table 16. XOSC Specifications (Temperature Range = –40 to 85 °C Ambient)
1
,C
2
and
), feedback resistor (R
MCF51EM256 Series ColdFire Microcontroller Data Sheet, Rev.3
Figure 12
High range (RANGE = 1), low power (HGO = 0)
Low range, low power (RANGE = 0, HGO = 0)
High range (RANGE = 1), high gain (HGO = 1)
4
Low range (RANGE=0), low power (HGO = 0)
Low range, high gain (RANGE = 0, HGO = 1)
Preliminary—Subject to Change Without Notice
Characteristic
for crystal or resonator circuits. XOSC1 operates only in low power
High range (RANGE = 1, HGO = X)
F
) and series resistor (R
Low range (RANGE = 0)
Other oscillator settings
High range, high power
Low range, high power
High range, low power
Low range, low power
FBE or FBELP mode
2
FEE mode
≥ 8 MHz
S
) are incorporated internally when RANGE = HGO = 0.
4 MHz
1 MHz
2
Symbol
C
t
t
CSTH
f
CSTL
extal
R
R
1,
f
f
f
lo
hi
hi
C
F
S
2
0.03125
Min
32
—
—
—
—
—
—
—
—
—
—
—
—
—
1
1
0
Freescale Semiconductor
Typ
100
600
400
10
15
—
—
—
See Note
See Note
—
—
—
—
1
0
0
0
0
5
1
50.33
50.33
Max
38.4
16
10
20
—
—
—
—
—
—
—
—
—
—
2
3
8
0
Unit
MHz
MHz
MHz
MHz
kHz
MΩ
ms
kΩ