mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 368

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 8 Pulse-Width Modulator (S12PWM8B8CV1)
1
8.3.2.1
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 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. Once concatenated mode is enabled (CONxx bits
set in PWMCTL register), enabling/disabling the corresponding 16-bit PWM channel is controlled by the
368
PWMPER7
PWMDTY0
PWMDTY1
PWMDTY2
PWMDTY3
PWMDTY4
PWMDTY5
PWMDTY6
PWMDTY7
PWMSDN
Intended for factory test purposes only.
Register
Name
W
W
W
W
W
W
W
W
W
W
R
R
R
R
R
R
R
R
R
R
PWM Enable Register (PWME)
The first PWM cycle after enabling the channel can be irregular.
PWMIF
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
= Unimplemented or Reserved
Figure 8-2. PWM Register Summary (Sheet 3 of 3)
PWMIE
6
6
6
6
6
6
6
6
6
6
MC9S12XDP512 Data Sheet, Rev. 2.17
PWMRSTRT
5
0
5
5
5
5
5
5
5
5
5
NOTE
PWMLVL
4
4
4
4
4
4
4
4
4
4
3
0
3
3
3
3
3
3
3
3
3
PWM7IN
2
2
2
2
2
2
2
2
2
2
PWM7INL
Freescale Semiconductor
1
1
1
1
1
1
1
1
1
1
PWM7ENA
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0