Datasheet

Section 24 Electrical Characteristics
Rev. 3.00 Sep. 28, 2009 Page 679 of 710
REJ09B0384-0300
24.3 AC Characteristics
Figure 24.3 shows the test conditions for the AC characteristics.
3 V
R
L
I/O timing test levels
• Low level : 0.8 V
• High level : 1.5 V
R
H
C
LSI output pin
C = 30pF : All ports
R
L
= 2.4 kΩ
R
H
= 12 kΩ
Figure 24.3 Output Load Circuit
24.3.1 Clock Timing
Table 24.4 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 table 24.5 and
24.6.
Table 24.4 Clock Timing
Condition: VCC = 3.0 V to 3.6 V, VSS = 0 V, φ = 20 MHz to 25 MHz
Item Symbol Min. Max. Unit Reference
Clock cycle time t
cyc
40 50 ns
Clock high level pulse
width
t
CH
10 ⎯
Clock low level pulse width t
CL
10 ⎯
Clock rise time t
Cr
⎯ 5
Clock fall time t
Cf
⎯ 5
Figure 24.4
Reset oscillation
stabilization (crystal)
t
OSC1
10 ⎯ ms Figure 24.5
Software standby
oscillation stabilization time
(crystal)
t
OSC2
8 ⎯ Figure 24.6