MC68HC908MR16CFU Freescale Semiconductor, MC68HC908MR16CFU Datasheet - Page 120

• Manufacturer Part Number: MC68HC908MR16CFU
• Description: IC MCU 8MHZ 16K FLASH 64-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908MR16CFU

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 44
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Pulse-Width Modulator for Motor Control (PWMMC)
12.3 Timebase
This section provides a discussion of the timebase.
12.3.1 Resolution
In center-aligned mode, a 12-bit up/down counter is used to create the PWM period. Therefore, the PWM
resolution in center-aligned mode is two clocks (highest resolution is 250 ns @ f
Figure
count. The PWM period will equal:
120
12-4. The up/down counter uses the value in the timer modulus register to determine its maximum
UP/DOWN COUNTER
Figure 12-4. Center-Aligned PWM (Positive Polarity)
MODULUS = 4
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
PWM = 0
PWM = 1
PWM = 2
PWM = 3
PWM = 4
[(timer modulus) x (PWM clock period) x 2].
PERIOD = 8 X (PWM CLOCK PERIOD)
OP
= 8 MHz) as shown in
Freescale Semiconductor