MC908AP8CFBE Datasheet, PDF(307/324 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC908AP8CFBE Datasheet, PDF (307/324 Pages) Freescale Semiconductor, Inc – Microcontrollers

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3V Oscillator Characteristics

22.11 3V Oscillator Characteristics

Table 22-10. Oscillator Speciï¬cations (3V)

Characteristic(1)

Internal oscillator clock frequency

Symbol

Min

fICLK

64 k

Typ

88 k(2)

Max

104 k

Unit

Hz

External reference clock to OSC1(3)

fOSC

dc

32 M

Hz

Crystal reference frequency

Crystal load capacitance(4)

Crystal ï¬xed capacitance(5)

Crystal tuning capacitance(6)

Feedback bias resistor

Series resistor

fXTALCLK

30

32.768

100

kHz

CL

â

12.5

â

pF

C1

â

15

â

pF

C2

â

15

â

pF

RB

1

10

22

Mâ¦

RS

100

330

470

kâ¦

External RC clock frequency

fRCCLK

7.6 M

Hz

RC oscillator external R

REXT

See Figure 22-1

â¦

RC oscillator external C

CEXT

â

10

â

pF

1. The oscillator circuit operates at VREG.

2. Typical value reflect average measurements at midpoint of voltage range, 25 Â°C only.

3. No more than 10% duty cycle deviation from 50%. The max. frequency is limited by an EMC filter.

4. Crystal manufacturer value.

5. Capacitor on OSC1 pin. Does not include parasitic capacitance due to package, pin, and board.

6. Capacitor on OSC2 pin. Does not include parasitic capacitance due to package, pin, and board.

MC68HC908AP Family Data Sheet, Rev. 4

Freescale Semiconductor

305

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