MC68HC908AT32 Datasheet, PDF (366/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
29.8 CGM Operating Conditions
Characteristic
Operating voltage
Crystal reference frequency
Module crystal reference frequency
Range nominal multiplier (MHz)
VCO center-of-range frequency (MHz)
VCO operating frequency (MHZ)
Symbol
V_DD
f_RCLK
f_XCLK
f_NOM
f_VRS
f_VCLK
Min
4.5 V
1
—
—
4.9152
4.9152
Typ
—
—
4.9152 MHz
4.9152
—
—
Max
5.5 V
8.4
—
—
32.0
32.0
Comments
Same frequency as f_RCLK
4.5–5.5 V, V_DD only
4.5–5.5 V, V_DD only
29.9 CGM Component Information
Description
Crystal load capacitance
Crystal fixed capacitance
Symbol
Min
C_L
—
C1
—
Crystal tuning capacitance
Filter capacitor multiply factor
C2
—
C_Fact
—
Filter capacitor
C_F
—
Bypass capacitor
C_BYP
—
Typ
—
2 x CL
2 x CL
0.0154
C_Fact x
(V_DDA/
f_XCLK)
0.1 µF
Max
Comments
—
Consult crystal
manufacturer’s data
—
Consult crystal
manufacturer’s data
—
Consult crystal
manufacturer’s data
—
F/s V
See 8.4.3 External Filter
—
Capacitor Pin
(CGMXFC)
C_BYP must provide low ac
impedance from
—
f = f_XCLK/100 to 100 x
f_VCLK, so series
resistance must be
considered.
MC68HC908AT32 Data Sheet, Rev. 3.1
366
Freescale Semiconductor