MC68HC908JK8CP Freescale Semiconductor, MC68HC908JK8CP Datasheet - Page 81

• 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

6.2.2 RC Oscillator
The RC oscillator circuit is designed for use with external resistor and capacitor 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:
6.3 Internal Oscillator
The internal oscillator clock (ICLK) is a free running 50-kHz clock that requires no external components.
It is used as the reference clock input to the computer operating properly (COP) module and the SIM.
The internal oscillator by default is always available and is free running after POR or reset. It can be
stopped in stop mode by setting the STOP_ICLKDIS bit before executing the STOP instruction.
Figure 6-4
Freescale Semiconductor
•
•
C
R
EXT
EXT
shows the logical representation of components of the internal oscillator circuitry.
From SIM
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
MCU
SIMOSCEN
V
DD
STOP_ICLKDIS
CONFIG2
Figure 6-3. RC Oscillator External Connections
EN
R
EXT
OSC1
OSCILLATOR
EXT-RC
Figure 6-4. Internal Oscillator
From SIM
C
SIMOSCEN
EXT
RCCLK
RCCLK/PTA6 (OSC2)
See
Chapter 17
0
1
2OSCOUT
for component value requirements.
EN
To SIM and COP
To SIM
OSCILLATOR
ICLK
INTERNAL
PTA6
I/O
÷ 2
OSCOUT
To SIM
PTA6
PTA6EN
Internal Oscillator
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