MCF51JE128 Ver la hoja de datos (PDF) - Freescale Semiconductor

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MCF51JE128

An Energy-Efficient Solution from Freescale

Freescale Semiconductor 

Preliminary Electrical Characteristics

Table 18. XOSC (Temperature Range = –40 to 105C Ambient)

#

Characteristic

Symbol Minimum Typical1 Maximum Unit

• Low range (RANGE = 0)

• High range (RANGE = 1),

• FEE or FBE mode 2

flo

32

—

38.4 kHz

fhi-fll

1

—

5

MHz

1

Oscillator crystal or resonator

(EREFS = 1, ERCLKEN = 1)

• High range (RANGE = 1),

• PEE or PBE mode 3

fhi-pll

1

—

16

MHz

• High range (RANGE = 1),

• High gain (HGO = 1),

• FBELP mode

fhi-hgo

1

—

16

MHz

• High range (RANGE = 1),

• Low power (HGO = 0),

• FBELP mode

fhi-lp

1

—

8

MHz

2 Load capacitors

Feedback resistor

3

Low range

(32 kHz to 38.4 kHz)

High range

(1 MHz to 16 MHz)

C1

C2

See Note 4

RF

—

10

—

—

1

—

M

—

Series resistor — Low range

4

Low Gain (HGO = 0)

High Gain (HGO = 1)

—

0

—

RS

k

—

100

—

• Low Gain (HGO = 0)

—

0

—

• High Gain (HGO = 1)

5 Series resistor — High range

 8 MHz

RS

—

0

0

k

4 MHz

—

0

10

1 MHz

—

0

20

6 Crystal start-up time 5, 6

Low range, low gain

(RANGE=0,HGO=0)

Low range, high gain

(RANGE=0,HGO=1)

—

200

t

CSTL

—

400

High range, low gain

(RANGE=1,HGO=0)

—

5

tCSTH

High range, high gain (RANGE=1,

HGO=1)

—

15

—

—

ms

—

—

1 Data in Typical column was characterized at 3.0 V, 25C or is typical recommended value.

2 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.

3 When MCG is configured for PEE or PBE mode, input clock source must be divisible using RDIV to within the range of 1 MHz to 2 MHz.

4 See crystal or resonator manufacturer’s recommendation.

5 This parameter is characterized and not tested on each device.

6 Proper PC board layout procedures must be followed to achieve specifications.

o

MCF51JE256 Datasheet, Rev. 4

Freescale Semiconductor

31

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