SC9S12XS256J1MAA FREESCALE [Freescale Semiconductor, Inc], SC9S12XS256J1MAA Datasheet - Page 264

• Manufacturer Part Number: SC9S12XS256J1MAA
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Pierce Oscillator (S12XOSCLCPV2)
9.1.3
Figure 9-1
9.2
This section lists and describes the signals that connect off chip
9.2.1
Theses pins provides operating voltage (V
allows the supply voltage to the XOSC to use an independent bypass capacitor.
9.2.2
These pins provide the interface for either a crystal or a 1.8V CMOS compatible clock to control the
internal clock generator circuitry. EXTAL is the external clock input or the input to the crystal oscillator
amplifier. XTAL is the output of the crystal oscillator amplifier. The MCU internal system clock is derived
264
External Signal Description
shows a block diagram of the XOSC.
Block Diagram
VDDPLL and VSSPLL — Operating and Ground Voltage Pins
EXTAL and XTAL — Input and Output Pins
Detector
Peak
EXTAL
S12XS Family Reference Manual, Rev. 1.09
Figure 9-1. XOSC Block Diagram
Gain Control
DDPLL
Monitor
Clock
) and ground (V
Rf
V
DDPLL
Monitor_Failure
= 1.8 V
OSCCLK
SSPLL
XTAL
) for the XOSC circuitry. This
Freescale Semiconductor