MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 145

• Manufacturer Part Number: MC68HC908LB8CPE
• Description: IC MCU 8K FLASH 8MHZ 20DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908LB8CPE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LVR, POR, PWM
• Number Of I /o: 18
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 7x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -

in
period will equal:
(timer modulus) x (PWM clock period)
15.3.2 Prescaler
To permit lower PWM frequencies, a prescaler is provided which will divide the PWM clock frequency by
1, 2, 4, or 8.
clock frequency. This prescaler is buffered and will not be used by the PWM generator until the LDOK bit
is set and a new PWM reload cycle begins.
Freescale Semiconductor
Figure
15-4. Again, the timer modulus register is used to determine the maximum count. The PWM
Table 15-1
shows how setting the prescaler bits in PWM control register 2 affects the PWM
Figure 15-4. Edge-Aligned PWM (Positive Polarity)
UP-ONLY COUNTER
MODULUS = 4
MC68HC908LB8 Data Sheet, Rev. 1
PWM = 0
PWM = 1
PWM = 2
PWM = 3
PWM = 4
PERIOD = 4 X (PWM
CLOCK PERIOD)
Timebase
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