MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 287
MC68HC908AZ32ACFU
Manufacturer Part Number
MC68HC908AZ32ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AZ32ACFU.pdf
(468 pages)
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18.4.4 Pulse Width Modulation (PWM)
68HC908AZ32A — Rev 0.0
MOTOROLA
NOTE:
pin. Writing to the TIMA channel 5 registers enables the TIMA channel 5
registers to synchronously control the output after the TIMA overflows.
At each subsequent overflow, the TIMA channel registers (4 or 5) that
control the output are the ones written to last. TASC4 controls and
monitors the buffered output compare function and TIMA channel 5
status and control register (TASC5) is unused. While the MS4B bit is set,
the channel 5 pin, PTF3/TCH5, is available as a general-purpose I/O pin.
In buffered output compare operation, do not write new output compare
values to the currently active channel registers. Writing to the active
channel registers is the same as generating unbuffered output
compares.
By using the toggle-on-overflow feature with an output compare channel,
the TIMA can generate a PWM signal. The value in the TIMA counter
modulo registers determines the period of the PWM signal. The channel
pin toggles when the counter reaches the value in the TIMA counter
modulo registers. The time between overflows is the period of the PWM
signal.
As
registers determines the pulse width of the PWM signal. The time
between overflow and output compare is the pulse width. Program the
TIMA to clear the channel pin on output compare if the state of the PWM
pulse is logic 1. Program the TIMA to set the pin if the state of the PWM
pulse is logic 0.
Freescale Semiconductor, Inc.
Figure 18-3
For More Information On This Product,
Timer Interface Module A (TIMA)
Go to: www.freescale.com
shows, the output compare value in the TIMA channel
Timer Interface Module A (TIMA)
Functional Description
Advance Information
287
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