S9S12P32J0VFTR Freescale Semiconductor, S9S12P32J0VFTR Datasheet - Page 242

• Manufacturer Part Number: S9S12P32J0VFTR
• Description: 16-bit Microcontrollers - MCU 16 BIT 32K FLASH
• Manufacturer: Freescale Semiconductor

Specifications of S9S12P32J0VFTR

• Rohs: yes
• Core: S12
• Processor Series: MC9S12P
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 16 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 2 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3.15 V to 5.5 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: QFN-48
• Mounting Style: SMD/SMT

S12 Clock, Reset and Power Management Unit (S12CPMU)
7.4.5.2
A spike in the oscillator clock can disturb the function of the modules driven by this clock.
The adaptive Oscillator Filter includes two features:
242
1. Filter noise (spikes) from the incoming external oscillator clock. The filter function is illustrated in
2. Detect severe noise disturbances on the external oscillator clock, which can not be filtered and
Figure
indicate the critical situation to the software by clearing the UPOSC and LOCK status bit and
setting the OSCIF and LOCKIF flag. An example for the detection of critical noise is illustrated in
Figure
OSCCLK
(filtered)
OSCCLK
(filtered)
OSCE
OSC
FILT
EXTAL
LOCK
UPOSC
OSCE
OSC
FILT
EXTAL
LOCK
UPOSC
The Adaptive Oscillator Filter
7-35.
7-36.
If the LOCK bit is clear due to severe noise disturbance on the external
oscillator clock the PLLCLK is derived from the VCO clock (with its actual
frequency) divided by four (see also
Divider Register
Figure 7-36. Critical noise detected by the Adaptive Oscillator Filter
0
0
Figure 7-35. Noise filtered by the Adaptive Oscillator Filter
enable external oscillator
configure the Oscillator Filter
enable external oscillator
configure the Oscillator Filter
> 0
> 0
(CPMUPOSTDIV))
crystal/resonator starts oscillating
crystal/resonator starts oscillating
S12P-Family Reference Manual, Rev. 1.13
NOTE
Section 7.3.2.3, “S12CPMU Post
phase shift can not be filtered but detected
filtered
filtered
Freescale Semiconductor