mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 148

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Pulse-Width Modulator for Motor Control
9.5.2 PWM Data Overflow and Underflow Conditions
9.6 Output Control
9.6.1 Selecting Six Independent PWMs or Three Complementary PWM Pairs
Advance Information
148
NOTE:
The PWM value registers are 16-bit registers. Although the counter is
only 12 bits, the user may write a 16-bit signed value to a PWM value
register. As shown in
less than or equal to zero, the PWM will be inactive for the entire period.
Conversely, if the PWM value is greater than or equal to the timer
modulus, the PWM will be active for the entire period. Refer to
The terms “active” and “inactive” refer to the asserted and negated
states of the PWM signals and should not be confused with the high-
impedance state of the PWM pins.
This subsection discusses output control.
The PWM outputs can be configured as six independent PWM channels
or three complementary channel pairs. The option INDEP determines
which mode is used (see
complementary operation is chosen, the PWM pins are paired as shown
in
value register. This type of operation is meant for use in motor drive
circuits such as the one in
PWMVALxH:PWMVALxL
Pulse-Width Modulator for Motor Control (PWMMC)
Figure
Table 9-3. PWM Data Overflow and Underflow Conditions
$8000–$FFFF
$0000–$0FFF
$1000–$7FFF
9-11. Operation of one pair is then determined by one PWM
Figure 9-3
5.3 Functional
Figure
Condition
Underflow
Overflow
Normal
and
9-12.
Figure
Description). If
9-4, if the PWM value is
MC68HC908MR24
Per register contents
Freescale Semiconductor
PWM Value Used
$FFF
$000
Table
—
Rev. 4.1
9-3.