mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 152

• Manufacturer Part Number: mc68hc908mr8
• Description: M68hc08 Microcontrollers Microcontroller
• 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
Technical Data
152
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 0, 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
is chosen, the PWM pins are paired as shown in
of one pair is then determined by one PWM value register. This type of
operation is meant for use in motor drive circuits such as the one in
Figure
PWMVALxH:PWMVALxL
Pulse-Width Modulator for Motor Control (PWMMC)
Table 9-3. PWM Data Overflow and Underflow Conditions
$8000–$FFFF
$0000–$0FFF
$1000–$7FFF
9-12.
Figure 9-3
5.4 CONFIG
Condition
Underflow
Overflow
Normal
and
Figure
Bits). If complementary operation
9-4, if the PWM value is
MC68HC908MR8 — Rev 4.1
Figure
Per registers contents
Freescale Semiconductor
PWM Value Used
9-11. Operation
$FFF
$000
Table
9-3.