M68ICS08GR datasheet(368/408 Pages) FREESCALE

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Electrical Specifications

Technical Data

MC68HC908GR8 — Rev 4.0

368

Electrical Specifications

MOTOROLA

23.7 5.0 V Control Timing

Table 23-6. 5.0 V Control Timing

Characteristic(1)

1. VSS = 0 Vdc; timing shown with respect to 20% VDD and 70% VSS unless otherwise noted.

Symbol

Min

Max

Unit

Frequency of operation(2)

Crystal option

External clock option(3)

2. See Clock Generation Module Characteristics for more information.

3. No more than 10% duty cycle deviation from 50%

fosc

dc(4)

4. Some modules may require a minimum frequency greater than dc for proper operation.

See appropriate table for this information.

100

32.8

kHz

MHz

Internal operating frequency

fop

—

8.2

MHz

Internal clock period (1/fOP)tcyc

122

—

RESET input pulse width low(5)

5. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse

width to cause a reset.

tIRL

—

IRQ interrupt pulse width low(6)

(edge-triggered)

6. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to

be recognized.

tILIH

—

IRQ interrupt pulse period

tILIL

Note 8

—

tcyc

16-bit timer(7)

Input capture pulse width

Input capture period

7. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to

be recognized.

8. The minimum period, tILIL or tTLTL, should not be less than the number of cycles it takes to

execute the interrupt service routine plus tcyc.

tTH,tTL

tTLTL

Note 8

—

tcyc

Notes:

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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