MC9S12C128CPBE Freescale Semiconductor, MC9S12C128CPBE Datasheet - Page 378
MC9S12C128CPBE
Manufacturer Part Number
MC9S12C128CPBE
Description
IC MCU 128K FLASH 25MHZ 52-LQFP
Manufacturer
Freescale Semiconductor
Series
HCS12r
Specifications of MC9S12C128CPBE
Core Processor
HCS12
Core Size
16-Bit
Speed
25MHz
Connectivity
CAN, EBI/EMI, SCI, SPI
Peripherals
POR, PWM, WDT
Number Of I /o
35
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.35 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
52-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Chapter 12 Pulse-Width Modulator (PWM8B6CV1) Block Description
Shown below is the output waveform generated.
12.4.2.6
For center aligned output mode selection, set the CAEx bit (CAEx = 1) in the PWMCAE register and the
corresponding PWM output will be center aligned.
The 8-bit counter operates as an up/down counter in this mode and is set to up whenever the counter is
equal to 0x0000. The counter compares to two registers, a duty register and a period register as shown in
the block diagram in
changes state causing the PWM waveform to also change state. A match between the PWM counter and
the period register changes the counter direction from an up-count to a down-count. When the PWM
counter decrements and matches the duty register again, the output flip-flop changes state causing the
PWM output to also change state. When the PWM counter decrements and reaches 0, the counter direction
changes from a down-count back to an up-count and a load from the double buffer period and duty
registers to the associated registers is performed as described in
Duty.”
effective period is PWMPERx*2.
378
The counter counts from 0 up to the value in the period register and then back down to 0. Thus the
PPOLx = 0
PPOLx = 1
Center Aligned Outputs
Changing the PWM output mode from left aligned output 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.
Figure
E = 100 ns
Figure 12-37. PWM Left Aligned Output Example Waveform
Figure 12-38. PWM Center Aligned Output Waveform
12-35. When the PWM counter matches the duty register the output flip-flop
PWMDTYx
MC9S12C-Family / MC9S12GC-Family
PWMPERx
PERIOD = 400 ns
DUTY CYCLE = 75%
Rev 01.24
NOTE
Period = PWMPERx*2
Section 12.4.2.3, “PWM Period and
PWMPERx
PWMDTYx
Freescale Semiconductor
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