MC68HC908JK8CP Freescale Semiconductor, MC68HC908JK8CP Datasheet - Page 80

• Manufacturer Part Number: MC68HC908JK8CP
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908JK8CP

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI
• Program Memory Type: Flash
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 15
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 13-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 20
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not Compliant

Oscillator (OSC)
OSCSEL — Oscillator Select Bit
Bits 6–0 — Should be left as logic 1’s.
6.2.1 XTAL Oscillator
The XTAL oscillator circuit is designed for use with an external crystal or ceramic resonator to provide
accurate clock source.
In its typical configuration, the XTAL 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.
80
Figure
OSCSEL selects the oscillator type for the MCU. The erased or unprogrammed state of this bit is
logic 1, selecting the crystal oscillator option. This bit is unaffected by reset.
•
•
•
•
•
1 = Crystal oscillator
0 = RC oscillator
Crystal, X
Fixed capacitor, C
Tuning capacitor, C
Feedback resistor, R
Series resistor, R
6-2. This figure shows only the logical representation of the internal components and may not
From SIM
When Crystal oscillator is selected, the OSC2/RCCLK/PTA6/KBI6 pin is
used as OSC2; other functions such as PTA6/KBI6 will not be available.
1
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
MCU
SIMOSCEN
S
) is included in the diagram to follow strict Pierce oscillator guidelines and may not
S
OSC1
1
Figure 6-2. XTAL Oscillator External Connections
(optional)
2
B
(can also be a fixed capacitor)
C
1
R
X
B
1
XTALCLK
2OSCOUT
OSC2
R
C
S
*
2
NOTE
*R
See
Refer to manufacturer’s data.
S
To SIM
can be zero (shorted) when used with higher-frequency crystals.
Chapter 17
÷ 2
OSCOUT
for component value requirements.
To SIM
Freescale Semiconductor