Datasheet

Section 28 Electrical Characteristics
Rev. 2.00 Sep. 28, 2009 Page 964 of 994
REJ09B0452-0200
28.3.1 Clock Timing
Table 28.5 shows the clock timing. The clock timing specified here covers clock output (φ) and
clock pulse generator (crystal) and external clock input (EXTAL pin) oscillation stabilization
times. For details of external clock input (EXTAL pin and EXCL pin) timing, see section 25,
Clock Pulse Generator.
Table 28.5 Clock Timing
Condition A: V
CC
= 3.0 V to 3.6 V, V
SS
= 0 V, φ = 8 MHz to 10 MHz
Condition B: V
CC
= 3.0 V to 3.6 V, V
SS
= 0 V, φ = 10 MHz to 20 MHz
Condition A Condition B
Item Symbol Min. Max. Min. Max. Unit Reference
Clock cycle time t
cyc
100 125 50 100
Clock high pulse width t
CH
30 ⎯ 20 ⎯
Clock low pulse width t
CL
30 ⎯ 20 ⎯
Clock rise time t
Cr
⎯ 20 ⎯ 5
Clock fall time t
Cf
⎯ 20 ⎯ 5
ns Figure 28.4
Reset oscillation stabilization (crystal) t
OSC1
20 ⎯ 20 ⎯ Figure 28.5
Software standby oscillation
stabilization time (crystal)
t
OSC2
8 ⎯ 8 ⎯
ms
Figure 28.6
External clock output stabilization delay
time
t
DEXT
500 ⎯ 500 ⎯ µs Figure 28.5
t
Cr
t
CL
t
Cf
t
CH
t
cyc
φ
Figure 28.4 System Clock Timing