MCR908JL3ECFAE Freescale Semiconductor, MCR908JL3ECFAE Datasheet - Page 67
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MCR908JL3ECFAE
Manufacturer Part Number
MCR908JL3ECFAE
Description
IC MCU 4K FLASH 8MHZ 48-LQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908JK1ECDWE.pdf
(180 pages)
Specifications of MCR908JL3ECFAE
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LED, LVD, POR, PWM
Number Of I /o
23
Program Memory Size
4KB (4K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.3 V
Data Converters
A/D 12x8b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
48-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Connectivity
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCR908JL3ECFAE
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Chapter 6
Oscillator (OSC)
6.1 Introduction
The oscillator module provides the reference clock for the MCU system and bus. Two types of oscillator
modules are available:
6.2 X-tal Oscillator (MC68HC908JL3E/JK3E/JK1E)
The X-tal oscillator circuit is designed for use with an external crystal or ceramic resonator to provide
accurate clock source.
In its typical configuration, the X-tal oscillator is connected in a Pierce oscillator configuration, as shown
in
represent actual circuitry. The oscillator configuration uses five components:
The series resistor (R
be required for all ranges of operation, especially with high frequency crystals. Refer to the crystal
manufacturer’s data for more information.
6.3 RC Oscillator (MC68HRC908JL3E/JK3E/JK1E)
The RC oscillator circuit is designed for use with external R and C to provide a clock source with tolerance
less than 10%.
In its typical configuration, the RC oscillator requires two external components, one R and one C.
Component values should have a tolerance of 1% or less, to obtain a clock source with less than 10%
tolerance. The oscillator configuration uses two components:
The RC connection is shown in
Freescale Semiconductor
Figure
•
•
•
•
•
•
•
•
•
MC68HC908JL3E/JK3E/JK1E — built-in oscillator module (X-tal) that requires an external crystal
or ceramic-resonator. This option also allows an external clock that can be driven directly into
OSC1.
MC68HRC908JL3E/JK3E/JK1E — built-in oscillator module (RC) that requires an external RC
connection only.
Crystal, X
Fixed capacitor, C
Tuning capacitor, C
Feedback resistor, R
Series resistor, R
C
R
EXT
EXT
6-1. This figure shows only the logical representation of the internal components and may not
1
S
) is included in the diagram to follow strict Pierce oscillator guidelines and may not
S
1
(optional)
2
B
(can also be a fixed capacitor)
Figure
MC68HC908JL3E Family Data Sheet, Rev. 4
6-2.
67
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