MC908QY8CDWE Datasheet, PDF(216/232 Page) Freescale Semiconductor, Inc – Addendum to MC68HC908QB8, rev. 3

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MC908QY8CDWE Datasheet, PDF (216/232 Pages) Freescale Semiconductor, Inc – Addendum to MC68HC908QB8, rev. 3

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Electrical Specifications

18.10 3-V Control Timing

Characteristic(1)

Symbol

Min

Max

Unit

Internal operating frequency

Internal clock period (1/fOP)

RST input pulse width low(2)

IRQ interrupt pulse width low (edge-triggered)(2)

IRQ interrupt pulse period(2)

fOP (fBus)

â

4

MHz

tcyc

250

â

ns

tRL

200

â

ns

tILIH

200

â

ns

tILIL

Note(3)

â

tcyc

1. VDD = 2.7 to 3.3 Vdc, VSS = 0 Vdc, TA = TL to TH; timing shown with respect to 20% VDD and 70% VDD, unless otherwise

noted.

2. Values are based on characterization results, not tested in production.

3. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 tcyc.

tRL

RST

tILIL

tILIH

IRQ

Figure 18-6. RST and IRQ Timing

MC68HC908QB8 Data Sheet, Rev. 3

214

Freescale Semiconductor

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