MC908AP32CFBE Freescale, MC908AP32CFBE Datasheet - Page 96

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MC908AP32CFBE

Manufacturer Part Number
MC908AP32CFBE
Description
Manufacturer
Freescale
Datasheet

Specifications of MC908AP32CFBE

Cpu Family
HC08
Device Core Size
8b
Frequency (max)
8MHz
Interface Type
SCI/SPI
Total Internal Ram Size
2KB
# I/os (max)
32
Number Of Timers - General Purpose
4
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
PQFP
Program Memory Type
Flash
Program Memory Size
32KB
Lead Free Status / RoHS Status
Compliant

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Clock Generator Module (CGM)
Temperature and processing also can affect acquisition time because the electrical characteristics of the
PLL change. The part operates as specified as long as these influences stay within the specified limits.
External factors, however, can cause drastic changes in the operation of the PLL. These factors include
noise injected into the PLL through the filter capacitor, filter capacitor leakage, stray impedances on the
circuit board, and even humidity or circuit board contamination.
6.8.3 Choosing a Filter
As described in
stability and reaction time of the PLL. The PLL is also dependent on reference frequency and supply
voltage.
Either of the filter networks in
(CGMRCLK).
low-cost applications where stability is not critical.
96
Figure 6-10
6.8.2 Parametric Influences on Reaction
(a) is used for applications requiring better stability.
0.22 µF
Figure 6-10
1 kΩ
MC68HC908AP Family Data Sheet, Rev. 4
CGMXFC
(a)
Figure 6-10. PLL Filter
V
is recommended when using a 32.768kHz reference clock
SSA
10 nF
Time, the external filter network is critical to the
CGMXFC
V
SSA
(b)
0.22 µF
Figure 6-10
Freescale Semiconductor
(b) is used in

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