MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 106

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Oscillator Module (OSC)
8.4.4 RC Oscillator
106
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
The RC oscillator circuit is designed for use with external R to provide a
clock source with tolerance less than 25%.
In its typical configuration, the RC oscillator requires two external
components, one R and one C. In the MC68HC908QY4, the capacitor is
internal to the chip. The R value should have a tolerance of 1% or less,
to obtain a clock source with less than 25% tolerance. The oscillator
configuration uses one component, R
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 function on the pin without affecting the clocks.
FROM SIM
MCU
SIMOSCEN
Note 1.
Figure 8-1. XTAL Oscillator External Connections
R
manufacturer’s data. See
value requirements.
S
OSC1
can be zero (shorted) when used with higher-frequency crystals. Refer to
Oscillator Module (OSC)
C
1
R
X
B
1
Section 18. Electrical Specifications
XTALCLK
BUSCLKX4
OSC2
R
C
S
(1)
2
TO SIM
EXT
.
BUSCLKX2
÷ 2
TO SIM
for component
MOTOROLA