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GPIx
GPOx
4
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2
1
5.6.2GPIOPeripheralExternalInterruptsElectricalData/Timing
EXT_INTx
2
1
TMS320DM355
DigitalMediaSystem-on-Chip(DMSoC)
SPRS463A–SEPTEMBER2007–REVISEDSEPTEMBER2007
Figure5-12.GPIOPortTiming
Table5-12.TimingRequirementsforExternalInterrupts/EDMAEvents
(1)
(seeFigure5-13)
DM355
NO.UNIT
MINMAX
1t
w(ILOW)
Widthoftheexternalinterruptpulselow52ns
2t
w(IHIGH)
Widthoftheexternalinterruptpulsehigh52ns
(1)ThepulsewidthgivenissufficienttogenerateaninterruptoranEDMAevent.However,ifauserwantstohavetorecognizetheGPIO
changesthroughsoftwarepollingoftheGPIOregister,theGPIOdurationmustbeextendedtoallowenoughtimetoaccesstheGPIO
registerthroughtheinternalbus.
Figure5-13.GPIOExternalInterruptTiming
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