mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 71

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

1.5
The Clock and Reset Generator provides the internal clock signals for the core and all peripheral modules.
Figure 1-7
Reset Generator (CRGV4)”
Freescale Semiconductor
System Clock Description
shows the clock connections from the CRG to all modules. Consult
EXTAL
XTAL
PE7 = XCLKS
OSC
for details on clock generation.
1
0
CRG
Table 1-6. Clock Selection Based on PE7
MC9S12E256 Data Sheet, Rev. 1.08
Figure 1-7. Clock Connections
Colpitts Oscillator selected
Pierce Oscillator/external clock selected
Bus Clock
Oscillator Clock
Description
Chapter 1 MC9S12E256 Device Overview (MC9S12E256DGV1)
Core Clock
TIM0, TIM1, TIM2
SCI0, SCI1, SCI2
HCS12 CORE
MEBI
BDM
INT
VREG
Flash
PWM
DAC
PMF
RAM
ATD
PIM
SPI
IIC
Chapter 4, “Clocks and
MMC
DBG
CPU
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