S912XEG128J2MAA Datasheet, PDF (699/1324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 19 Pulse-Width Modulator (S12PWM8B8CV1)
Module Base + 0x0002
R
W
Reset
7
PCLK7
0
6
PCLKL6
5
PCLK5
4
PCLK4
3
PCLK3
2
PCLK2
0
0
0
0
0
Figure 19-5. PWM Clock Select Register (PWMCLK)
1
PCLK1
0
Read: Anytime
Write: Anytime
NOTE
Register bits PCLK0 to PCLK7 can be written anytime. If a clock select is
changed while a PWM signal is being generated, a truncated or stretched
pulse can occur during the transition.
Table 19-4. PWMCLK Field Descriptions
Field
7
PCLK7
6
PCLK6
5
PCLK5
4
PCLK4
3
PCLK3
2
PCLK2
1
PCLK1
0
PCLK0
Description
Pulse Width Channel 7 Clock Select
0 Clock B is the clock source for PWM channel 7.
1 Clock SB is the clock source for PWM channel 7.
Pulse Width Channel 6 Clock Select
0 Clock B is the clock source for PWM channel 6.
1 Clock SB is the clock source for PWM channel 6.
Pulse Width Channel 5 Clock Select
0 Clock A is the clock source for PWM channel 5.
1 Clock SA is the clock source for PWM channel 5.
Pulse Width Channel 4 Clock Select
0 Clock A is the clock source for PWM channel 4.
1 Clock SA is the clock source for PWM channel 4.
Pulse Width Channel 3 Clock Select
0 Clock B is the clock source for PWM channel 3.
1 Clock SB is the clock source for PWM channel 3.
Pulse Width Channel 2 Clock Select
0 Clock B is the clock source for PWM channel 2.
1 Clock SB is the clock source for PWM channel 2.
Pulse Width Channel 1 Clock Select
0 Clock A is the clock source for PWM channel 1.
1 Clock SA is the clock source for PWM channel 1.
Pulse Width Channel 0 Clock Select
0 Clock A is the clock source for PWM channel 0.
1 Clock SA is the clock source for PWM channel 0.
0
PCLK0
0
19.3.2.4 PWM Prescale Clock Select Register (PWMPRCLK)
This register selects the prescale clock source for clocks A and B independently.
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor
699