MC68HC908LB8_05 Datasheet, PDF (224/234 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Electrical Specifications
NOTES:
1. V_SS = 0 Vdc; timing shown with respect to 20% V_DD and 70% V_DD unless otherwise noted.
2. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
3. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to be recognized.
t_RL
RST
t_ILIL
t_ILIH
IRQ
Figure 20-1. RST and IRQ Timing
20.7 Oscillator Characteristics
Characteristic
Symbol
Min
Typ
Max
Internal oscillator frequency (factory trimmed)
f_INTCLK
15.2
16⁽¹⁾
16.8
Crystal frequency, XTALCLK
f_OSCXCLK
8
—
24
External RC oscillator frequency, RCCLK
f_RCCLK
2
—
12
External clock reference frequency⁽²⁾
f_OSCXCLK
dc
—
32
Crystal load capacitance⁽³⁾
C_L
—
20
—
Crystal fixed capacitance⁽²⁾
C₁
—
2 x C_L
—
Crystal tuning capacitance⁽²⁾
C₂
—
2 x C_L
—
Feedback bias resistor
R_B
—
10
—
RC oscillator external resistor
R_EXT
See Figure 20-2
NOTES:
1. Characterization shows that ± 3.5% could be achieved from -40 to 85°C.
2. No more than 10% duty cycle deviation from 50%.
3. Consult crystal vendor data sheet.
Unit
MHz
MHz
MHz
MHz
pF
—
—
MΩ
—
MC68HC908LB8 Data Sheet, Rev. 1
224
Freescale Semiconductor