MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 389
MC9S12E32CFU
Manufacturer Part Number
MC9S12E32CFU
Description
HCS12 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12E32CFU.pdf
(606 pages)
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12.3.2.3
Each PWM channel has a choice of two clocks to use as the clock source for that channel as described
below.
Read: anytime
Write: anytime
Freescale Semiconductor
PPOL2
PPOL1
PPOL0
PCLK5
PCLK4
PCLK3
Reset
Field
Field
2
1
0
5
4
3
W
R
Pulse Width Channel 2 Polarity
0 PWM channel 2 output is low at the beginning of the period, then goes high when the duty count is reached.
1 PWM channel 2 output is high at the beginning of the period, then goes low when the duty count is reached.
Pulse Width Channel 1 Polarity
0 PWM channel 1 output is low at the beginning of the period, then goes high when the duty count is reached.
1 PWM channel 1 output is high at the beginning of the period, then goes low when the duty count is reached.
Pulse Width Channel 0 Polarity
0 PWM channel 0 output is low at the beginning of the period, then goes high when the duty count is reached
1 PWM channel 0 output is high at the beginning of the period, then goes low when the duty count is reached.
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.
PWM Clock Select Register (PWMCLK)
0
0
7
Register bits PCLK0 to PCLK5 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.
= Unimplemented or Reserved
0
0
6
Table 12-3. PWMPOL Field Descriptions (continued)
Figure 12-5. PWM Clock Select Register (PWMCLK)
Table 12-4. PWMCLK Field Descriptions
PCLK5
MC9S12E128 Data Sheet, Rev. 1.07
0
5
PCLK4
NOTE
0
4
Description
Description
PCLK3
0
3
Chapter 12 Pulse-Width Modulator (PWM8B6CV1)
PCLK2
0
2
PCLK1
0
1
PCLK0
0
0
389
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