SPRS293A − OCTOBER 2005 − REVISED NOVEMBER 2005
85
POST OFFICE BOX 1443
•
HOUSTON, TEXAS 77251−1443
EXTERNAL INTERRUPT TIMING
timing requirements for external interrupts
†
(see Figure 40)
NO.
−150
UNIT
NO.
MIN
MAX
UNIT
1
tw(ILOW)
Width of the NMI interrupt pulse low
2P
ns
1
tw(ILOW)
Width of the EXT_INT interrupt pulse low
4P
ns
2
tw(IHIGH)
Width of the NMI interrupt pulse high
2P
ns
2
tw(IHIGH)
Width of the EXT_INT interrupt pulse high
4P
ns
† P = 1/CPU clock frequency in ns. For example, when running parts at 100 MHz, use P = 10 ns.
2
1
EXT_INT, NMI
Figure 40. External/NMI Interrupt Timing