MC9S12XDP512CFU
Model | MC9S12XDP512CFU |
Description | 16-BIT, FLASH, 40MHz, MICROCONTROLLER, PQFP80 |
PDF file | Total 1348 pages (File size: 8M) |
Chip Manufacturer | PHILIPS |
Chapter 3 Pierce Oscillator (S12XOSCLCPV1)
EXTAL input frequency. In full stop mode (PSTP = 0), the EXTAL pin is pulled down by an internal
resistor of typical 200 kΩ.
NOTE
Freescale recommends an evaluation of the application board and chosen
resonator or crystal by the resonator or crystal supplier.
Loop controlled circuit is not suited for overtone resonators and crystals.
EXTAL
C1
MCU
XTAL
C2
V
SSPLL
Crystal or
Ceramic Resonator
Figure 3-2. Loop Controlled Pierce Oscillator Connections (XCLKS = 1)
NOTE
Full swing Pierce circuit is not suited for overtone resonators and crystals
without a careful component selection.
EXTAL
C1
MCU
RS*
XTAL
C2
V
SSPLL
* R
s
can be zero (shorted) when use with higher frequency crystals.
Refer to manufacturer’s data.
RB
Crystal or
Ceramic Resonator
Figure 3-3. Full Swing Pierce Oscillator Connections (XCLKS = 0)
EXTAL
MCU
XTAL
CMOS Compatible
External Oscillator
(V
DDPLL
Level)
Not Connected
Figure 3-4. External Clock Connections (XCLKS = 0)
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
121