mcf51mm256 Freescale Semiconductor, Inc, mcf51mm256 Datasheet - Page 35

• Manufacturer Part Number: mcf51mm256
• Description: 32-bit Coldfire V1 Central Processor Unit
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
1
2
3
4
5
o
#
1
2
3
4
5
6
Data in Typical column was characterized at 3.0 V, 25°C or is typical recommended value.
When MCG is configured for FEE or FBE mode, input clock source must be divisible using RDIV to within the range of 31.25 kHz to
39.0625 kHz.
See crystal or resonator manufacturer’s recommendation.
This parameter is characterized and not tested on each device.
Proper PC board layout procedures must be followed to achieve specifications.
Oscillator crystal or resonator
(EREFS = 1, ERCLKEN = 1)
Load capacitors
Feedback resistor
Series resistor — Low range
Series resistor — High range
Crystal start-up time
Table 18. XOSC (Temperature Range = –40 to 105
4, 5
Characteristic
Low range
(32 kHz to 38.4 kHz)
High range
(1 MHz to 16 MHz)
Low Gain (HGO = 0)
High Gain (HGO = 1)
Low range, low gain (RANGE = 0,
HGO = 0)
Low range, high gain (RANGE =
0, HGO = 1)
High range, low gain (RANGE = 1,
HGO = 0)
High range, high gain (RANGE =
1, HGO = 1)
• Low range (RANGE = 0)
• High range (RANGE = 1),
• FEE or FBE mode
• High range (RANGE = 1),
• High gain (HGO = 1),
• FBELP mode
• High range (RANGE = 1),
• Low power (HGO = 0),
• FBELP mode
• Low Gain (HGO = 0)
• High Gain (HGO = 1)
≥ 8 MHz
4 MHz
1 MHz
2
Symbol
t
t
CSTH
CSTL
R
R
C
C
R
fhi
fhi
fhi
—
f
lo
S
S
1
2
F
°
C Ambient)
Preliminary Electrical Characteristics
Min
32
—
—
—
—
—
—
—
—
—
—
—
1
1
1
Typ
100
200
400
10
15
—
—
—
—
See Note
1
0
0
0
0
5
1
3
Max
38.4
16
10
20
—
—
—
—
—
—
—
—
5
8
0
MHz
MHz
MHz
Unit
kHz
MΩ
kΩ
kΩ
ms
35