MC908AS60ACFU Datasheet, PDF (372/414 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Electrical Specifications
28.1.8 CGM Operating Conditions
Characteristic
Symbol
Min
Typ
Max
Unit
Comments
Operating Voltage
Crystal Reference Frequency
Module Crystal Reference Frequency
Range Nom. Multiplier
VCO Center-of-Range Frequency
VCO Operating Frequency
V_DDA
V_SSA
f_CGMRCLK
f_CGMXCLK
f_NOM
f_CGMVRS
f_CGMVCLK
V_DD–0.3
V_SS–0.3
1
—
—
4.9152
4.9152
—
—
4.9152
4.9152
4.9152
—
—
V_DD+0.3
V_SS+0.3
8
—
—
Note⁽¹⁾
32.0
V
V
MHz
MHz
MHz
MHz
Same Frequency
as f_CGMRCLK
1. f_CGMVRS is a nominal value described and calculated as an example in Chapter 10 Clock Generator Module (CGM) for the desired VCO
operating frequency, f_CGMVCLK.
28.1.9 CGM Component Information
Description
Crystal Load Capacitance
Crystal Fixed Capacitance
Crystal Tuning Capacitance
Filter Capacitor Multiply Factor
Filter Capacitor
Bypass Capacitor
Symbol Min
Typ
Max Unit
Comments
C_L
—
—
—
—
Consult Crystal
Manufacturer’s Data
C1
—
2 x CL
—
—
Consult Crystal
Manufacturer’s Data
C2
—
2 x CL
—
—
Consult Crystal
Manufacturer’s Data
C_fact
—
0.0154
— F/s V
C_F
—
C_FACT x
(V_DDA/f_XCLK)
—
—
See 10.4.3 External Filter
Capacitor Pin (CGMXFC)
CBYP must provide low AC
impedance from
C_BYP
—
0.1
—
μF
f = f_CGMXCLK/100 to 100 x
f_CGMVCLK, so series
resistance must be
considered.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
372
Freescale Semiconductor