MC908AZ32ACFUE Datasheet, PDF (304/324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
25.1.8 CGM Operating Conditions
Characteristic
Operating Voltage
Crystal Reference Frequency
Module Crystal Reference
Frequency
Range Nom. Multiplier
Symbol
V_DDA
V_SSA
f_CGMRCLK
f_CGMXCLK
f_NOM
Min
V_DD-0.3
V_SS-0.3
1
—
—
Typ
—
—
4.9152
4.9152
4.9152
Max
V_DD+0.3
V_SS+0.3
16
—
—
VCO Center-of-Range Frequency f_CGMVRS 4.9152
—
Note 1
VCO Operating Frequency
f_CGMVCLK 4.9152
—
32.0
Unit
V
V
MHz
MHz
MHz
MHz
Comments
Same Frequency
as f_CGMRCLK
f_CGMVRS is a nominal
value described and
calculated as an
example in the Chapter
8 Clock Generator
Module (CGM) section
for the desired VCO
operating frequency,
f_CGMVCLK.
25.1.9 CGM Component Information
Description
Crystal Load Capacitance
Symbol
Min
Typ
Max
C_L
—
—
—
Crystal Fixed Capacitance
C1
—
2 x CL
—
Crystal Tuning Capacitance
Filter Capacitor Multiply Factor
Filter Capacitor
C2
C_fact
C_F
—
2 x CL
—
—
0.0154
—
C_FACT x
—
(V_DDA/
—
f_XCLK)
Bypass Capacitor
C_BYP
—
0.1
—
Unit
—
—
—
F/s V
—
μF
Comments
Consult Crystal
Manufacturer’s Data
Consult Crystal
Manufacturer’s Data
Consult Crystal
Manufacturer’s Data
See 8.4.3 External
Filter Capacitor Pin
(CGMXFC)
CBYP must provide
low AC impedance
from f = f_CGMXCLK/100
to 100 x f_CGMVCLK, so
series resistance must
be considered.
MC68HC908AZ32A Data Sheet, Rev. 2
304
Freescale Semiconductor