MC68HC908SR12CFA Freescale Semiconductor, MC68HC908SR12CFA Datasheet - Page 215

• Manufacturer Part Number: MC68HC908SR12CFA
• Description: MICROCONTROLLER 48 PIN
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908SR12CFA

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SCI
• Peripherals: LVD, POR, PWM, Temp Sensor
• Number Of I /o: 31
• Program Memory Size: 12KB (12K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: Q1145673

13.5 PWM Automatic Phase Control
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
PWM2
PWM1
PWM0
256 × T
PHASE VALUE 1
The automatic phase control function allows precise phase difference
between the PWM output signals.
Figure 13-4
Use the following steps to generate phase difference on PWM channels:
When phase control is enabled, the PWM2 counter will start counting
immediately, but the PWM1 and PWM0 counters will be held at zero.
After the PWM2 counter reaches the phase value, PH[0:6], the PWM1
counter is released and starts counting. Finally, when the PMW1 counter
reaches the phase value, PH[0:6], PWM0 is released and starts
counting. It is possible to change the value of PH[0:6] after the PWM1
counter has started and before the start of the PWM0 counter. This way,
difference phases can be set between PWM2 and PWM1; PWM1 and
PWM0.
Figure 13-4. PWM Automatic Phase Control
1. Clear PWM enable bits, PWMEN[0:2], to logic 0.
2. Write delay value in PHD[0:6].
3. Set PWM automatic phase control enable bit, PHEN, to logic 1.
4. Set the PWM channel enable bits, PCH[0:2], to logic 1.
5. Set the PWM enable bits, PWMEN[0:2], to logic 1, to enable the
PWM counters.
PHASE VALUE 2
Pulse Width Modulator (PWM)
shows the phase delays between the PWM output signals.
256 × T
256 × T
256 × T
PWM Automatic Phase Control
Pulse Width Modulator (PWM)
Data Sheet
215