MC68HC711E20CFS2 MOTOROLA [Motorola, Inc], MC68HC711E20CFS2 Datasheet - Page 160
MC68HC711E20CFS2
Manufacturer Part Number
MC68HC711E20CFS2
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC711E20CFS2.pdf
(268 pages)
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Timing System
9.7 Pulse Accumulator
Data Sheet
160
MCU PIN
FROM MAIN TIMER
PA7/
PAI/
OC1
E
÷
MAIN TIMER
64 CLOCK
FROM
OC1
DDRA7
FROM
OUTPUT
BUFFER
EDGE DETECTOR
The M68HC11 Family of MCUs has an 8-bit counter that can be configured to
operate either as a simple event counter or for gated time accumulation, depending
on the state of the PAMOD bit in the PACTL register. Refer to the pulse
accumulator block diagram,
counter is clocked to increasing values by an external pin. The maximum clocking
rate for the external event counting mode is the E clock divided by two. In gated
time accumulation mode, a free-running E-clock divide-by-64 signal drives the 8-bit
counter, but only while the external PAI pin is activated. Refer to
pulse accumulator counter can be read or written at any time.
INPUT BUFFER
AND
Freescale Semiconductor, Inc.
For More Information On This Product,
TMSK2 INT ENABLES
PACTL CONTROL
Figure 9-24. Pulse Accumulator
Go to: www.freescale.com
DATA
BUS
Timing System
MUX
2
:
1
Figure
9-24. In the event counting mode, the 8-bit
CLOCK
PAI EDGE
PAEN
PAEN
INTERNAL
DATA BUS
TFLG2 INTERRUPT STATUS
ENABLE
OVERFLOW
PACNT 8-BIT COUNTER
PAOVI
PAOVF
PAII
PAIF
M68HC11E Family — Rev. 5
DISABLE
FLAG SETTING
Table
INTERRUPT
REQUESTS
MOTOROLA
9-6. The
1
2
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