Clock Timing; Figure 21.2 System Clock Timing; Table 21.4 Clock Timing - Renesas H8S Series Hardware Manual

Section 21 Electrical Characteristics
21.3.1

Clock Timing

Table 21.4 lists the clock timing

Table 21.4 Clock Timing

Conditions : V = 4.5 V to 5.5 V, AV
CC
20 MHz, T
range specifications)
Item
Clock cycle time
Clock high pulse width
Clock low pulse width
Clock rise time
Clock fall time
Oscillation stabilization time at
reset (crystal)
Oscillation stabilization time in
software standby (crystal)
External clock output
stabilization delay time
Rev. 6.00 Mar 15, 2006 page 512 of 570
REJ09B0211-0600
= 4.5 V to 5.5 V, V
CC
= –20°C to +75°C (regular specifications), T
a
Symbol Min.
t 50
cyc
t 15
CH
t 15
CL
t —
Cr
t —
Cf
t 20
OSC1
t 8
OSC2
t 2
DEXT
t
CH
φ

Figure 21.2 System Clock Timing

= AV
SS
Max.
250
—
—
10
10
—
—
—
t
cyc
t
Cf
t
t
CL Cr
= 0 V, φ = 4 MHz to
SS
= –40°C to +85°C (wide-
a
Unit Test Conditions
ns Figure 21.2
ns
ns
ns
ns
ms Figure 21.3
ms Figure 20.3
ms Figure 21.3