sc9s12hy64j0vllr Freescale Semiconductor, Inc, sc9s12hy64j0vllr Datasheet - Page 270

• Manufacturer Part Number: sc9s12hy64j0vllr
• Description: S12 Microcontrollers Mcu 16-bit Hcs12 Cisc 32kb Flash 5v Tray
• Manufacturer: Freescale Semiconductor, Inc

S12 Clock, Reset and Power Management Unit (S12CPMU) Block Description
7.4.5
7.4.5.1
An example of how to use the oscillator as Bus Clock is shown in
270
EXTAL
UPOSC
OSCCLK
PLLSEL
Core
Clock
OSCE
External Oscillator
Enabling the External Oscillator
enable external oscillator by writing OSCE bit to one.
based on PLLCLK
crystal/resonator starts oscillating
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
Figure 7-34. Enabling the External Oscillator
select OSCCLK as Core/Bus Clock by writing PLLSEL to zero
UPOSC flag is set upon successful start of oscillation
based on OSCCLK
Figure
7-34.
Freescale Semiconductor