MC68HC908QY4CDW Datasheet, PDF(157/184 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC68HC908QY4CDW Datasheet, PDF (157/184 Pages) Freescale Semiconductor, Inc – Microcontrollers

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3-V Control Timing

16.11 3-V Control Timing

Characteristic(1)

Internal operating frequency

Internal clock period (1/fOP)

RST input pulse width low

IRQ interrupt pulse width low (edge-triggered)

IRQ interrupt pulse period

Symbol

fOP (fBus)

tcyc

tRL

tILIH

tILIL

Min

â

250

200

200

Note(2)

Max

4

â

â

â

â

Unit

MHz

ns

ns

ns

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. 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 16-7. RST and IRQ Timing

MC68HC908QY/QT Family Data Sheet, Rev. 6

Freescale Semiconductor

157

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