MC68HC908MR8CFA Freescale Semiconductor, MC68HC908MR8CFA Datasheet - Page 157

• Manufacturer Part Number: MC68HC908MR8CFA
• Description: IC MCU 8K FLASH 8MHZ PWM 32-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908MR8CFA

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 7x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

9.6.3 Output Polarity
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
UP/DOWN COUNTER
NO DEAD-TIME
NO DEAD-TIME
DEAD-TIME = 3
DEAD-TIME = 3
MODULUS = 3
NOTE:
PWM1 W/
PWM2 W/
PWM1 W/
PWM2 W/
PWM VALUE = 2
Figure 9-16. Dead-Time and Small Pulse Widths
The output polarity of the PWMs is determined by two options: TOPNEG
and BOTNEG. The top polarity option, TOPNEG, controls the polarity of
PWMs 1, 3, and 5. The bottom polarity option, BOTNEG, controls the
polarity of PWMs 2, 4, and 6. Positive polarity means that when the PWM
is active, the PWM output is high. Conversely, negative polarity means
that when the PWM is active, PWM output is low. See
Both bits are found in the CONFIG register, which is a write-once
register. This reduces the chances of the software inadvertently
changing the polarity of the PWM signals and possibly damaging the
motor drive hardware.
Pulse-Width Modulator for Motor Control (PWMMC)
3
PWM VALUE = 3
3
PWM VALUE = 2
Pulse-Width Modulator for Motor Control (PWMMC)
3
PWM VALUE= 1
3
3
Figure
Technical Data
Output Control
3
9-17.
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