MC68HC908GT16_07 Datasheet, PDF(260/292 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC68HC908GT16_07 Datasheet, PDF (260/292 Pages) Freescale Semiconductor, Inc – Microcontrollers

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Electrical Specifications

20.8 5-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

122

50

50

Note(2)

Max

8

â

â

â

â

Unit

MHz

ns

ns

ns

tcyc

1. VDD = 4.5 to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH; timing shown with respect to 20% VDD and 70% VSS, 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 20-1. RST and IRQ Timing

20.9 3-V Control Timing

Characteristic(1)

Symbol

Min

Max

Unit

Internal operating frequency

Internal clock period (1/fOP)

RST input pulse width low

IRQ interrupt pulse width low (edge-triggered)

IRQ interrupt pulse period

fOP (fBus)

â

4

MHz

tcyc

244

â

ns

tRL

125

â

ns

tILIH

125

â

ns

tILIL

Note(2)

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. 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 20-2. RST and IRQ Timing

MC68HC908GT16 â¢ MC68HC908GT8 â¢ MC68HC08GT16 Data Sheet, Rev. 5.0

260

Freescale Semiconductor

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