MC68L300 Datasheet, PDF (25/32 Pages) Freescale Semiconductor, Inc – 16.78 MHz Electrical Characteristics

Freescale Semiconductor, Inc.
PHI1^*
PHI1^*/4
PAEN
EXT PIN (PAI)
A
B
PACNT
$77
$78
PAIF
NOTE: 1.
2.
3.
4.
5.
A = PAI signal after the synchronizer
B = “A” after the digital filter
PHI1*/4 clocks PACNT when GT-PAIF is asserted.
PAIF is asserted when PAI is negated.
*PHI1 _{has the same frequency as the system clock; however, it does not have the same timing.}
Figure 23 Pulse Accumulator — Gated Mode (Count While Pin High)
MC68L300EC16/D
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