MC9RS08LA8 Datasheet, PDF (17/34 Pages) Freescale Semiconductor, Inc – MCU Block Diagram

Electrical Characteristics
6 _{Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum fBUS.}
Measurements are made with the device powered by filtered supplies and clocked by a stable external clock signal. Noise
injected into the FLL circuitry via V_DD and V_SS and variation in crystal oscillator frequency increase the C_Jitter percentage
for a given interval.
EXTAL
XOSC
R_F
XTAL
R_S
Crystal or Resonator
C₁
C₂
Figure 9. Typical Crystal or Resonator Circuit
3.8 AC Characteristics
This section describes ac timing characteristics for each peripheral system.
3.8.1 Control Timing
Table 10. Control Timing
Parameter
Symbol
Min
Typical
Max
Unit
Bus frequency (t_cyc = 1/f_Bus)
f_Bus
0
—
10
MHz
Real time interrupt internal oscillator period
External RESET pulse width¹
KBI pulse width²
KBI pulse width in stop¹
Port rise and fall time (load = 50 pF)³
Slew rate control disabled (PTxSE = 0)
Slew rate control enabled (PTxSE = 1)
t_RTI
t_extrst
t_KBIPW
t_KBIPWS
t_Rise, t_Fall
700
150
1.5 t_cyc
100
—
—
1000
—
—
—
11
35
1300
μs
—
ns
—
ns
—
ns
—
ns
—
1 _{This is the shortest pulse that is guaranteed to pass through the pin input filter circuitry. Shorter pulses may or may not be}
recognized.
2 _{This is the minimum pulse width that is guaranteed to pass through the pin synchronization circuitry. Shorter pulses may or}
may not be recognized. In stop mode, the synchronizer is bypassed so shorter pulses can be recognized in that case.
3 _{Timing is shown with respect to 20% VDD and 80% VDD levels. Temperature range –40°C to 85°C.}
MC9RS08LA8 Series MCU Data Sheet, Rev. 1
Freescale Semiconductor
17