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| MC3S12RG128 Datasheet, PDF (56/546 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 1 Device Overview (MC3S12RG128V1)
EXTAL
MCU
XTAL
CDC *
C1
Crystal or
ceramic resonator
C2
VSSPLL
* Due to the nature of a translated ground Colpitts oscillator a
DC voltage bias is applied to the crystal
Please contact the crystal manufacturer for crystal DC
bias conditions and recommended capacitor value CDC.
Figure 1-7. Colpitts Oscillator Connections (PE7=1)
EXTAL
MCU
XTAL
RB
RS*
C1
Crystal or
ceramic resonator
C2
VSSPLL
* Rs can be zero (shorted) when used with higher frequency crystals.
Refer to manufacturerâs data.
Figure 1-8. Pierce Oscillator Connections (PE7=0)
EXTAL
MCU
XTAL
CMOS-COMPATIBLE
EXTERNAL OSCILLATOR
(VDDPLL-Level)
not connected
Figure 1-9. External Clock Connections (PE7=0)
1.2.3.13 PE6 / MODB / IPIPE1 â Port E I/O Pin 6
PE6 is a general purpose input or output pin. It is used as an MCU operating mode select pin during reset.
The state of this pin is latched to the MODB bit at the rising edge of RESET. This pin is shared with the
MC3S12RG128 Data Sheet, Rev. 1.05
56
Freescale Semiconductor
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