MC68HC908QT2CPE Freescale, MC68HC908QT2CPE Datasheet - Page 93

• Manufacturer Part Number: MC68HC908QT2CPE
• Manufacturer: Freescale

Specifications of MC68HC908QT2CPE

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Total Internal Ram Size: 128Byte
• # I/os (max): 6
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 4-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 8
• Package Type: PDIP
• Program Memory Type: Flash
• Program Memory Size: 1.5KB
• Lead Free Status / RoHS Status: Compliant

11.3.4 RC Oscillator
The RC oscillator circuit is designed for use with an external resistor (R
a tolerance within 25% of the expected frequency. See
The capacitor (C) for the RC oscillator is internal to the MCU. The R
1%
In this configuration, the OSC2 pin can be left in the reset state as PTA4. Or, the OSC2EN bit in the port
A pullup enable register can be set to enable the OSC2 output function on the pin. Enabling the OSC2
output slightly increases the external RC oscillator frequency, f
11.4 Oscillator Module Signals
The following paragraphs describe the signals that are inputs to and outputs from the oscillator module.
11.4.1 Crystal Amplifier Input Pin (OSC1)
The OSC1 pin is either an input to the crystal oscillator amplifier, an input to the RC oscillator circuit, or
an external clock source.
For the internal oscillator configuration, the OSC1 pin can assume other functions according to
Function Priority in Shared
Freescale Semiconductor
or less to minimize its effect on the frequency.
See
FROM SIM
Chapter 16 Electrical Specifications
MCU
SIMOSCEN
V
DD
Figure 11-3. RC Oscillator External Connections
Pins.
EN
R
EXT
EXTERNAL RC
OSC1
OSCILLATOR
MC68HC908QY/QT Family Data Sheet, Rev. 6
for component value requirements.
INTCLK
RCCLK
PTA4/BUSCLKX4 (OSC2)
Figure
0
1
1
0
11-3.
RCCLK
OSCRCOPT
TO SIM
PTA4
EXT
BUSCLKX4
I/O
.
EXT
value must have a tolerance of
÷ 2
) to provide a clock source with
TO SIM
BUSCLKX2
Oscillator Module Signals
PTA4
OSC2EN
Table 1-3.
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