MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 347

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

16.8.4 Pulse Accumulator
16.8.4.1 Event Counter Mode
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
NOTE:
Writing to the timer port bit of an output compare pin does not affect the
pin state. The value written is stored in an internal latch. When the pin
becomes available for general-purpose output, the last value written to
the bit appears at the pin.
The pulse accumulator (PA) is a 16-bit counter that can operate in two
modes:
The PA mode bit, PAMOD, selects the mode of operation.
The minimum pulse width for the PAI input is greater than two module
clocks.
Clearing the PAMOD bit configures the PA for event counter operation.
An active edge on the PAI pin increments the PA. The PA edge bit,
PEDGE, selects falling edges or rising edges to increment the PA.
An active edge on the PAI pin sets the PA input flag, PAIF. The PA input
interrupt enable bit, PAI, enables the PAIF flag to generate interrupt
requests.
The PAI input and timer channel 3 use the same pin. To use the PAI
input, disconnect it from the output logic by clearing the channel 3 output
mode and output level bits, OM3 and OL3. Also clear the channel 3
output compare 3 mask bit, OC3M3.
The PA counter registers, TIMPACNTH/L, reflect the number of active
input edges on the PAI pin since the last reset.
1. Event counter mode — Counts edges of selected polarity on the
2. Gated time accumulation mode — Counts pulses from a
Freescale Semiconductor, Inc.
For More Information On This Product,
pulse accumulator input pin, PAI
divide-by-64 clock
Timer Modules (TIM1 and TIM2)
Go to: www.freescale.com
Timer Modules (TIM1 and TIM2)
Functional Description
Advance Information
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