MC68HC908JB8JP Freescale Semiconductor, MC68HC908JB8JP Datasheet - Page 91

• Manufacturer Part Number: MC68HC908JB8JP
• Description: IC MCU FLASH 8BIT 8K 20-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908JB8JP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 3MHz
• Connectivity: USB
• Peripherals: LVD, POR, PWM
• Number Of I /o: 13
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

7.4 I/O Signals
7.4.1 Crystal Amplifier Input Pin (OSC1)
7.4.2 Crystal Amplifier Output Pin (OSC2)
7.4.3 Oscillator Enable Signal (SIMOSCEN)
7.4.4 External Clock Source (OSCXCLK)
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
The series resistor (R
oscillator guidelines and may not be required for all ranges of operation,
especially with high-frequency crystals. Refer to the crystal
manufacturer’s data for more information.
The following paragraphs describe the oscillator input/output (I/O)
signals.
The OSC1 pin is an input to the crystal oscillator amplifier.
The OSC2 pin is the output of the crystal oscillator inverting amplifier.
The SIMOSCEN signal comes from the system integration module (SIM)
and enables the oscillator.
The crystal oscillator output signal passes through the clock doubler and
OSCXCLK is the output signal of the clock doubler. OSCXCLK runs at
twice the speed of the crystal (f
relation of OSCXCLK to OSC1 and OSC2 and may not represent the
actual circuitry. The duty cycle of OSCXCLK is unknown and may
depend on the crystal and other external factors. Also, the frequency and
amplitude of OSCXCLK can be unstable at startup.
Oscillator (OSC)
S
) is included in the diagram to follow strict Pierce
XCLK
).
Figure 7-1
shows only the logical
Oscillator (OSC)
Technical Data
I/O Signals
91