MC9S12Q32VFA16 FREESCALE [Freescale Semiconductor, Inc], MC9S12Q32VFA16 Datasheet - Page 370
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MC9S12Q32VFA16
Manufacturer Part Number
MC9S12Q32VFA16
Description
HCS12 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12Q32VFA16.pdf
(644 pages)
- Current page: 370 of 644
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Chapter 12 Pulse-Width Modulator (PWM8B4CRev 01.24) Block Description
12.4.1.3
Each PWM channel has the capability of selecting one of two clocks. For channels 0, and 1 the clock
choices are clock A or clock SA. For channels 2 and 3 the choices are clock B or clock SB. The clock
selection is done with the PCLKx control bits in the PWMCLK register.
12.4.2
The main part of the PWM module are the actual timers. Each of the timer channels has a counter, a period
register and a duty register (each are 8 bit). The waveform output period is controlled by a match between
the period register and the value in the counter. The duty is controlled by a match between the duty register
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.
370
Clock Source
PWMEx
(clock edge sync)
PWM Channel Timers
Clock Select
GATE
Changing clock control bits while channels are operating can cause
irregularities in the PWM outputs.
up/down
reset
Figure 12-29. PWM Timer Channel Block Diagram
8-Bit Counter
PWMCNTx
Q
Q
T
R
MC9S12Q128
Rev 1.10
NOTE
Figure 12-29
8-Bit Compare =
8-Bit Compare =
PWMDTYx
PWMPERx
CAEx
shows a block diagram for PWM timer.
T
R
Q
Q
PPOLx
M
U
X
From Port PWMP
Data Register
Freescale Semiconductor
M
U
X
To Pin
Driver
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