MM912H634CM1AER2 Freescale Semiconductor, MM912H634CM1AER2 Datasheet - Page 98
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MM912H634CM1AER2
Manufacturer Part Number
MM912H634CM1AER2
Description
64KS12 LIN2xLS/HS Isense
Manufacturer
Freescale Semiconductor
Series
-r
Datasheet
1.MM912G634CM1AE.pdf
(345 pages)
Specifications of MM912H634CM1AER2
Applications
Automotive
Core Processor
HCS12
Program Memory Type
FLASH (64 kB)
Controller Series
HCS12
Ram Size
6K x 8
Interface
LIN
Number Of I /o
-
Voltage - Supply
5.5 V ~ 27 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
48-LQFP Exposed Pad
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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in
down to 0. Thus the effective period is PWMPERx*2.
To calculate the output frequency in center aligned output mode for a particular channel, take the selected clock source frequency
for the channel (A, B, SA, or SB) and divide it by twice the value in the period register for that channel.
As an example of a center aligned output, consider the following case:
Figure 28
4.14.4.2.7
Table 131
Freescale Semiconductor
Section 4.14.4.2.3, “PWM Period and
•
•
E = 100 µs
PWMx Frequency = Clock (A, B, SA, or SB) / (2*PWMPERx)
PWMx Duty Cycle (high time as a% of period):
— Polarity = 0 (PPOLx = 0)
Duty Cycle = [(PWMPERx-PWMDTYx)/PWMPERx] * 100%
— Polarity = 1 (PPOLx = 1)
Duty Cycle = [PWMDTYx / PWMPERx] * 100%
Clock Source = E, where E = 10 kHz (100 µs period)
PWMx Frequency = 10 kHz/8 = 1.25 kHz
PWMx Period = 800 µs
PWMx Duty Cycle = 3/4 *100% = 75%
shows the output waveform generated.
summarizes the boundary conditions for the PWM, regardless of the output mode (left aligned or center aligned).
PPOLx = 0
PPOLx = 1
PPOLx = 0
PWMPERx = 4
PWMDTYx = 1
Changing the PWM output mode from left aligned to center aligned output (or vice versa)
while channels are operating can cause irregularities in the PWM output. It is recommended
to program the output mode before enabling the PWM channel.
PWM Boundary Cases
Figure 28. PWM Center Aligned Output Example Waveform
PWMDTYx
Figure 27. PWM Center Aligned Output Waveform
Duty”. The counter counts from 0 up to the value in the period register and then back
MM912_634 Advance Information, Rev. 4.0
PWMPERx
DUTY CYCLE = 75%
PERIOD = 800 µs
Period = PWMPERx*2
NOTE
PWMPERx
PWM Control Module (PWM8B2C)
PWMDTYx
E = 100 µs
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