mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 356

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

A-30
MOTOROLA
EXT PIN (PAI)
Figure A-25 Pulse Accumulator — Event Counting Mode (Leading Edge)
PAOVF
NOTES:
PACNT
PAEN
PHI1
PAIF
1. PHI1 IS THE SAME FREQUENCY AS THE SYSTEM CLOCK; HOWEVER, IT DOES NOT HAVE THE SAME TIMING.
2. A = PAI SIGNAL AFTER THE SYNCHRONIZER.
3. B = “A” AFTER THE DIGITAL FILTER.
4. THE EXTERNAL LEADING EDGE CAUSES THE PULSE ACCUMULATOR TO INCREMENT AND THE PAIF FLAG TO BE SET.
5. THE COUNTER TRANSITION FROM $FF TO $00 CAUSES THE PAOVF FLAG TO BE SET.
A
B
1
2
3
4
5
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
$FF
$00
MC68HC16Y3/916Y3
USER’S MANUAL
PULSE ACCUM ECM LEAD EDGE