MC68HCP11 Datasheet, PDF (40/45 Pages) Motorola, Inc – 8-Bit Microcontroller

PAEN — Pulse Accumulator System Enable
0 = Pulse Accumulator disabled
1 = Pulse Accumulator enabled
PAMOD — Pulse Accumulator Mode
0 = Event counter
1 = Gated time accumulation
PEDGE — Pulse Accumulator Edge Control
PAMOD
0
0
1
1
PEDGE
0
1
0
1
Action on Clock
PAI falling edge increments the counter
PAI rising edge increments the counter
A zero on PAI inhibits counting
A one on PAI inhibits counting
RTR1 and RTR0 — Real-Time Interrupt (RTI) Rate
Refer to 8 Main Timer.
PACNT — Pulse Accumulator Counter
$1027
Bit 7
6
5
4
3
2
1
Bit 0
Bit 7
6
5
4
3
2
1
Bit 0
RESET:
0
0
0
0
0
0
0
0
Can be read and written.
MOTOROLA
40
MC68HC11A8
MC68HC11A8TS/D