MC68HC908QY4CDW Datasheet, PDF (154/184 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
16.8 5-V Oscillator Characteristics
Characteristic
Symbol
Min
Internal oscillator frequency⁽¹⁾
Deviation from trimmed Internal oscillator ⁽²⁾⁽³⁾
12.8 MHz, fixed voltage, fixed temp
12.8 MHz, V_DD ± 10%, 0 to 70°C
12.8 MHz, V_DD ± 10%, –40 to 125°C
Crystal frequency, XTALCLK⁽¹⁾
f_INTCLK
—
ACC_INT
—
—
—
f_OSCXCLK
1
External RC oscillator frequency, RCCLK⁽¹⁾
f_RCCLK
2
External clock reference frequency^{(1) (4)}
Crystal load capacitance⁽⁵⁾
f_OSCXCLK
dc
C_L
—
Crystal fixed capacitance⁽³⁾
C₁
—
Crystal tuning capacitance⁽³⁾
Feedback bias resistor
RC oscillator external resistor
Crystal series damping resistor
f_OSCXCLK = 1 MHz
f_OSCXCLK = 4 MHz
f_OSCXCLK = > 8 MHz
C₂
—
R_B
0.5
R_EXT
R_S
—
—
—
1. Bus frequency, f_OP, is oscillator frequency divided by 4.
2. Deviation values assumes trimming @25•C and midpoint of voltage range.
3. Values are based on characterization results, not tested in production.
4. No more than 10% duty cycle deviation from 50%.
5. Consult crystal vendor data sheet.
Typ
12.8
± 0.4
±2
—
—
—
—
20
2 x C_L
2 x C_L
1
See Figure 16-4
20
10
0
Max
—
—
—
±5
24
12
32
—
—
—
10
—
—
—
14
5 V 25°C
12
10
8
6
4
2
0
0
10
20
30
40
50
60
R_EXT (kΩ)
Figure 16-4. RC versus Frequency (5 Volts @ 25•C)
Unit
MHz
%
MHz
MHz
MHz
pF
—
—
MΩ
—
kΩ
MC68HC908QY/QT Family Data Sheet, Rev. 6
154
Freescale Semiconductor