MC68HC08LT8 Datasheet, PDF (149/156 Pages) Freescale Semiconductor, Inc – Microcontrollers

Oscillator Characteristics
t_RL
RST
t_ILIL
t_ILIH
IRQ
Figure 16-1. RST and IRQ Timing
16.11 Oscillator Characteristics
Table 16-10. Oscillator Specifications
Characteristic
Symbol
Min
Typ
Oscillator 1 on OSC1 and OSC2 (for system bus)
External reference clock to OSC1 ⁽¹⁾
f_OSC
dc
—
Crystal reference frequency ⁽²⁾
Crystal load capacitance ⁽³⁾
f_XTALCLK1
1M
—
C_L
—
—
Crystal fixed capacitance ⁽³⁾
C₁
—
18
Crystal tuning capacitance ⁽³⁾
C₂
—
18
Feedback bias resistor
R_B1
—
4.7
Series resistor
R_S1
—
0
Oscillator 2 on XTAL1 and XTAL2 (for LCD and PPI)
Crystal reference frequency ⁽²⁾
f_XTALCLK2
—
32.768 k
Crystal load capacitance ⁽³⁾
Crystal fixed capacitance ⁽³⁾
C_L
—
—
C₃
—
10
Crystal tuning capacitance ⁽³⁾
C₄
—
10
Feedback bias resistor
Series resistor
R_B2
—
10
R_S2
—
10
1. No more than 10% duty cycle deviation from 50%.
2. Use fundamental mode only, do not use overtone crystals or overtone ceramic resonators.
3. Consult crystal vendor data sheet.
Max
16 M
16 M
—
—
—
—
—
—
—
—
—
—
—
Unit
Hz
Hz
pF
pF
MΩ
kΩ
Hz
pF
pF
MΩ
kΩ
16.12 Timer Interface Module Characteristics
Table 16-11. Timer Interface Module Characteristics
Characteristic
Input capture pulse width
Symbol
t_TIH, t_TIL
Min
1/f_OP
Max
Unit
—
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
149