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18.3.3
AC Characteristics
Table 18.10 lists the AC characteristics. Tables 18.11 and 18.12 list the PC bus interface timing
and the serial interface timing, respectively.
Table 18.10 AC Characteristics
V
= 2.7 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
= 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
383
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