mc68hc711k4 Freescale Semiconductor, Inc, mc68hc711k4 Datasheet - Page 196

• Manufacturer Part Number: mc68hc711k4
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

Timing System
9.6 Output Compare (OC)
Technical Data
196
The output compare (OC) function generates a programmed action
when the 16-bit counter reaches a specified value. Each of the five
output compare functions contains a separate 16-bit timer output
compare (TOC) register and a dedicated 16-bit comparator. Each TOC
register is set to $FFFF on reset. When an OC channel is enabled, the
value in its TOC register is compared to the free-running counter value
during each E-clock cycle. When the values match, the channel’s output
compare flag is set in timer interrupt flag 1 (TFLG1). If the channel’s
interrupt is enabled in the timer interrupt mask register 1 (TMSK1), an
interrupt is generated. Also, the corresponding timer output pin is
toggled or driven to a specified logic level. This pin activity occurs on
each successful compare, whether or not the OCxF flag in the TFLG1
register was previously cleared.
The pin action for each of the OC channels [5:2] is controlled by a pair of
bits (OMx and OLx) in the TCTL1 register and affects only the channel’s
associated pin. A successful OC1 compare can affect any or all five of
the OC pins. The action taken when a match is found for OC1 is
controlled by two 8-bit registers:
OC1M specifies which port A outputs are to be used, and OC1D
specifies the data placed on these port pins.
Although the M68HC11K series devices have four built-in pulse-width
modulation (PWM) channels
output compare function can be used to produce an additional
pulse-width modulated waveform. To produce a pulse of a specific
duration:
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Freescale Semiconductor, Inc.
For More Information On This Product,
Output compare 1 mask register (OC1M)
Output compare 1 data register (OC1D)
Write a value to the output compare register that represents the
time the leading edge of the pulse is to occur.
Use OC1D to select either a high or low output, depending on the
polarity of the pulse being produced.
Go to: www.freescale.com
Timing System
(9.9 Pulse-Width Modulator
M68HC11K Family
(PWM)), the
MOTOROLA