Ac Characteristics - Hitachi H8/3664 Hardware Manual

18.2.3

AC Characteristics

Table 18.3 lists the AC characteristics. Tables 18.4 and 18.5 list the PC bus interface timing and
the serial interface timing, respectively.
Table 18.3 AC Characteristics
V = 3.0 V to 5.5 V, V
CC
Item Symbol
System clock f
oscillation
frequency
System clock (ø) t
cycle time
Subclock oscillation f
frequency
Watch clock (ø ) t
W
cycle time
Subclock (ø ) t
SUB
cycle time
Instruction cycle
time
Oscillation t
stabilization time
(crystal oscillator)
Oscillation t
stabilization time
(ceramic oscillator)
Oscillation t
stabilization time
External clock t
high width
External clock t
low width
External clock t
rise time
External clock t
fall time
368
= 0.0 V, T = –20°C to +75°C, unless otherwise specified.
SS a
Applicable
Pins
1
OSC ,
OSC
2
OSC
cyc
1 2
X , X
W
1 2
X , X
W
subcyc
1
OSC ,
rc
2
OSC
1
OSC ,
rc
2
OSC
1 2
X , X
rcx
1
OSC
CPH
1
OSC
CPL
1
OSC
CPr
1
OSC
CPf
Values
Min Typ Max
2.0 — 16.0
2.0 10.0
1 — 64
— — 12.8
— 32.768 —
— 30.5 —
2 — 8
2 — —
— — 10.0
— — 5.0
— — 2.0
25.0 — —
40.0 — —
25.0 — —
40.0 — —
— — 10.0
— — 15.0
— — 10.0
— — 15.0
Unit Test Condition
MHz V = 4.0 V to 5.5 V *1
CC
t
OSC
µs
kHz
µs
t
W
t
cyc
t
subcyc
ms
ms
s
ns V = 4.0 V to 5.5 V Figure 18.1
CC
ns V = 4.0 V to 5.5 V
CC
ns V = 4.0 V to 5.5 V
CC
ns V = 4.0 V to 5.5 V
CC
Reference
Figure
*2
*2