S912XEQ384J3MALR Freescale Semiconductor, S912XEQ384J3MALR Datasheet - Page 713

Manufacturer Part Number

S912XEQ384J3MALR

S912XEQ Series 16 Bit 50 Mhz 384 KB Flash 24 KB Ram Microcontroller - LQFP-112

Manufacturer

Freescale Semiconductor

and the counter value and causes the state of the output to change during the period. The starting polarity

of the output is also selectable on a per channel basis. Shown below in

for the PWM timer.

Each PWM channel has an enable bit (PWMEx) to start its waveform output. When any of the PWMEx

bits are set (PWMEx = 1), the associated PWM output signal is enabled immediately. However, the actual

PWM waveform is not available on the associated PWM output until its clock source begins its next cycle

due to the synchronization of PWMEx and the clock source. An exception to this is when channels are

concatenated. Refer to

On the front end of the PWM timer, the clock is enabled to the PWM circuit by the PWMEx bit being high.

There is an edge-synchronizing circuit to guarantee that the clock will only be enabled or disabled at an

edge. When the channel is disabled (PWMEx = 0), the counter for the channel does not count.

Freescale Semiconductor

Clock Source

The ﬁrst PWM cycle after enabling the channel can be irregular.

Section 19.4.2.7, “PWM 16-Bit Functions”

8-Bit Counter

Figure 19-19. PWM Timer Channel Block Diagram

MC9S12XE-Family Reference Manual Rev. 1.24

8-bit Compare =

Chapter 19 Pulse-Width Modulator (S12PWM8B8CV1)

for more detail.

Figure 19-19

From Port PWMP

Data Register

is the block diagram