15.2.3
AC Characteristics
Table 15-3 lists the control signal timing, and tables 15-4 and 15-5 list the serial interface timing
of the H8/3887 Series.
Table 15-3 Control Signal Timing
VCC = 1.8 V to 5.5 V, AVCC = 1.8 V to 5.5 V, VSS = AVSS = 0.0 V, Ta = –20°C to +75°C
(including subactive mode) unless otherwise indicated.
Applicable Values
Reference
Figure
Item
Symbol Pins
Min
Typ
—
—
—
—
—
—
—
—
—
—
—
—
Max
6
Unit Test Condition
MHz VCC = 4.5V to 5.5 V
VCC = 3.0V to 5.5 V
VCC = 2.6V to 5.5 V
VCC = 2.2V to 5.5 V
Except the above
2
System clock
oscillation
frequency
fOSC
OSC1, OSC2 0.4
*
0.4
4
0.4
3.2
2
0.4
0.4
1
OSC clock (øOSC) tOSC
cycle time
OSC1, OSC2 167
2500 ns
2500
VCC = 4.5V to 5.5 V
VCC = 3.0V to 5.5 V
VCC = 2.6V to 5.5 V
VCC = 2.2V to 5.5 V
Except the above
Figure 15-1
2
250
313
500
1000
2
*
2500
2500
Figure 15-1
2500
System clock (ø) tcyc
cycle time
128
tOSC
—
244.1 µs
Subclock oscilla- fW
tion frequency
X1, X2
X1, X2
—
—
2
32.768 —
or 38.4
kHz
Watch clock (øW) tW
cycle time
30.5 or —
26.0
µs
Figure 15-1
1
Subclock (øSUB
cycle time
)
tsubcyc
—
8
tW
*
Instruction cycle
time
2
—
—
45
8
tcyc
tsubcyc
Oscillation
stabilization time
trc
OSC1, OSC2
—
—
20
0.1
µs
VCC = 2.2 V to 5.5 V (In Figure 15-10
2
case of Figure 15-10)
*
ms VCC = 2.2 V to 5.5 V (In Figure 15-10
case of Figure 15-10)
—
—
—
—
50
ms Except the above
s
Oscillation
trc
X1, X2
2.0
stabilization time
384
ETC [ ETC ]
