MC68HC908RF2CFA Freescale Semiconductor, MC68HC908RF2CFA Datasheet - Page 70

• Manufacturer Part Number: MC68HC908RF2CFA
• Description: IC MCU W/UHF TX 2K FLASH 32LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908RF2CFA

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: LVD, POR, PWM, RF Mod
• Number Of I /o: 12
• Program Memory Size: 2KB (2K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -

Internal Clock Generator Module (ICG)
6.3.3 External Clock Generator
6.3.3.1 External Oscillator Amplifier
Data Sheet
70
ECGON
STOP
EXTSLOW
NAME
NAME
NAME
NAME
The ICG also provides for an external oscillator or clock source, if desired. The
external clock generator, shown in
amplifier and an external clock input path.
The external oscillator amplifier provides the gain required by an external crystal
connected in a Pierce oscillator configuration. The amount of this gain is controlled
by the slow external (EXTSLOW) bit in the configuration register. When EXTSLOW
is set, the amplifier gain is reduced for operating low-frequency crystals (32 kHz to
100 kHz). When EXTSLOW is clear, the amplifier gain will be sufficient for 1-MHz to
8-MHz crystals. EXTSLOW must be configured correctly for the given crystal or the
circuit may not operate.
Figure 6-3. External Clock Generator Block Diagram
INTERNAL TO MCU
MODULE SIGNAL
REGISTER BIT
EXTERNAL
CONFIGURATION REGISTER BIT
TOP LEVEL SIGNAL
Freescale Semiconductor, Inc.
For More Information On This Product,
Internal Clock Generator Module (ICG)
GENERATOR
EXTERNAL
CLOCK
Go to: www.freescale.com
OSC1
Figure
C
1
R
X
B
1
6-3, contains an external oscillator
C
INPUT PATH
AMPLIFIER
R
S
2
*
OSC2
COMPONENTS REQUIRED FOR
EXTERNAL CRYSTAL USE ONLY
*R
with higher-frequency crystals.
Refer to manufacturer’s data.
S
can be 0 (shorted) when used
MC68HC908RF2 — Rev. 4.0
ECLK
MOTOROLA