MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 141

• 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: -

Chapter 15
Pulse Width Modulator with Fault Input (PWM)
15.1 Introduction
This section describes the pulse-width modulator with fault input (PWM). The MC68HC908LB8 PWM
module can generate two independent PWM signals. These PWM signals are edge-aligned. A block
diagram of the PWM module is shown in
A 12-bit timer PWM counter is common to both channels. PWM resolution is one clock period for
edge-aligned operation. The clock period is dependent on the internal operating frequency (BUSCLK) and
a programmable prescaler.
The highest resolution for edge-aligned operation is 125 ns (BUSCLK = 8 MHz).
A summary of the PWM registers is shown in
15.2 Features
Features of the PWMMC include:
Freescale Semiconductor
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Two independent PWM signals
Edge-aligned PWM signals
PWM signal polarity control
Programmable fault protection
MC68HC908LB8 Data Sheet, Rev. 1
Figure
Figure
15-2.
15-3.
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