MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 180
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MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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Timer Interface Module A (TIMA)
11.5.4.3 PWM Initialization
Technical Data
180
NOTE:
To ensure correct operation when generating unbuffered or buffered
PWM signals, use the following initialization procedure:
In PWM signal generation, do not program the PWM channel to toggle
on output compare. Toggling on output compare prevents reliable 0%
duty cycle generation and removes the ability of the channel to self-
correct in the event of software error or noise. Toggling on output
compare can also cause incorrect PWM signal generation when
changing the PWM pulse width to a new, much larger value.
Setting MS0B links channels 0 and 1 and configures them for buffered
PWM operation. The TIMA channel 0 registers (TACH0H:TACH0L)
initially control the buffered PWM output. TIMA channel 0 status and
control register 0 (TASC0) controls and monitors the PWM signal from
the linked channels. MS0B takes priority over MS0A.
1. In the TIMA status and control register (TASC):
2. In the TIMA counter modulo registers (TAMODH:TAMODL), write
3. In the TIMA channel x registers (TACHxH:TACHxL), write the
4. In TIMA channel x status and control register (TASCx):
5. In the TIMA status control register (TASC), clear the TIMA stop bit,
Freescale Semiconductor, Inc.
For More Information On This Product,
the value for the required PWM period.
value for the required pulse width.
TSTOP.
a. Stop the TIMA counter by setting the TIMA stop bit, TSTOP.
b. Reset the TIMA counter by setting the TIMA reset bit, TRST.
a. Write 0:1 (for unbuffered output compare or PWM signals) or
a. Write 1 to the toggle-on-overflow bit, TOVx.
b. Write 1:0 (to clear output on compare) or 1:1 (to set output on
Timer Interface Module A (TIMA)
1:0 (for buffered output compare or PWM signals) to the
mode select bits, MSxB:MSxA. See
compare) to the edge/level select bits, ELSxB:ELSxA. The
output action on compare must force the output to the
complement of the pulse width level. See
Go to: www.freescale.com
MC68HC908AB32
Table
Table
11-3.
11-3.
MOTOROLA
—
Rev. 1.0
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