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Rev. 1.00, 05/04, page 521 of 544
22.3.1 Clock Timing
Table 22.5 shows the clock timing. The clock timing specified here covers clock (φ) output and
clock pulse generator (crystal) and external clock input (EXTAL pin) oscillation settling times.
For details on external clock input (EXTAL pin and EXCL pin) timing, see section19, Clock Pulse
Generator.
Table 22.5 Clock Timing
Condition: V
CC
= 3.0 V to 3.6 V, V
CC
B = 3.0 V to 5.5 V, V
SS
= 0 V, φ = 4 MHz to maximum
operating frequency, T
a
= –20 to +75°C
Condition
10 MHz
Item Symbol
Min. Max.
Unit Reference
Clock cycle time t
cyc
100 250 ns
Clock high pulse width t
CH
30 — ns
Clock low pulse width t
CL
30 — ns
Clock rise time t
Cr
— 20 ns
Clock fall time t
Cf
— 20 ns
Figure 22.5
Oscillation settling time at reset (crystal) t
OSC1
20 — ms
Oscillation settling time in software
standby (crystal)
t
OSC2
8 — ms
External clock output stabilization delay
time
t
DEXT
500 — µs
Figure 22.6
Figure 22.7