MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 91
MC68HC908LB8CPE
Manufacturer Part Number
MC68HC908LB8CPE
Description
IC MCU 8K FLASH 8MHZ 20DIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC68HC908LB8CDWE.pdf
(234 pages)
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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68HC908LB8CPE
Manufacturer:
IR
Quantity:
10
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Chapter 10
High Resolution PWM (HRP)
10.1 Introduction
The High Resolution PWM (HRP) provides two complementary outputs that can be used to control
half-bridge systems in, for example, light ballast applications. It uses a dithering control method to provide
a high step resolution (3.906 ns from an 8 MHz input clock). It also provides a shutdown input that can be
used to disable the outputs when a fault condition is detected in the application.
The pins supporting the HRP can be seen in
shown in
10.2 Features
Features of the HRP include:
10.3 Pin Name Conventions
The HRP shares two output pins with two port B input/output (I/O) pins and one input pin with one port C
input pin.
Freescale Semiconductor
•
•
•
•
•
•
•
One complementary output pair for driving a half bridge
Dithering between two frequencies or duty cycles, for increased output resolution
Automatic calculation of second frequency or duty cycle for output dithering
Variable frequency mode with automatic 50% duty cycle calculation
Variable duty cycle mode
Programmable deadtime insertion
Shutdown input for fast disabling of outputs
Figure
10-3.
HRP Generic Pin Name
Table 10-1. Pin Naming Conventions
SHTDWN
MC68HC908LB8 Data Sheet, Rev. 1
TOP
BOT
Figure
10-1, and a block diagram of the HRP module is
PTC2/SHTDWN/IRQ
Full HRP Pin Name
PTB0/TOP
PTB1/BOT
91
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