S912XEP768J5MAGR Freescale Semiconductor, S912XEP768J5MAGR Datasheet - Page 88

• Manufacturer Part Number: S912XEP768J5MAGR
• Description: 16-bit Microcontrollers - MCU 16-bit 768K Flash
• Manufacturer: Freescale Semiconductor

Specifications of S912XEP768J5MAGR

• Rohs: yes
• Core: HCS12X
• Processor Series: MC9S12
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 768 KB
• Data Ram Size: 48 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3.3 V to 5 V
• Operating Temperature Range: - 40 C to + 125 C
• Package / Case: LQFP-144
• Mounting Style: SMD/SMT

Chapter 1 Device Overview MC9S12XE-Family
1.13
The XCLKS is an input signal which controls whether a crystal in combination with the internal loop
controlled (low power) Pierce oscillator is used or whether full swing Pierce oscillator/external clock
circuitry is used. For this device XCLKS is mapped to PE7.
The XCLKS signal selects the oscillator configuration during reset low phase while a clock quality check
is ongoing. This is the case for:
The selected oscillator configuration is frozen with the rising edge of the RESET pin in any of these above
described reset cases.
88
•
•
•
Power on reset or low-voltage reset
Clock monitor reset
Any reset while in self-clock mode or full stop mode
Oscillator Configuration
Figure 1-10. Loop Controlled Pierce Oscillator Connections (XCLKS = 1)
Figure 1-11. Full Swing Pierce Oscillator Connections (XCLKS = 0)
MCU
Figure 1-12. External Clock Connections (XCLKS = 0)
EXTAL
XTAL
MC9S12XE-Family Reference Manual Rev. 1.25
MCU
MCU
EXTAL
EXTAL
XTAL
R
XTAL
B
=1MΩ ; R
R
S
R
B
S
Not Connected
specified by crystal vendor
Ceramic Resonator
Crystal or
CMOS-Compatible
External Oscillator
C
C
Ceramic Resonator
1
2
Crystal or
C
C
1
2
V
SSPLL
V
SSPLL
Freescale Semiconductor