Ac Characteristics - Hitachi H8/3937 Series Hardware Manual

13.2.3

AC Characteristics

Table 13-3 lists the control signal timing, and tables 13-4 list the serial interface timing of the
H8/3937 Series and 3937R Series.
Table 13-3 Control Signal Timing
V = 1.8 V to 3.6 V, AV
CC
(including subactive mode) unless otherwise indicated.
Item Symbol Pins
System clock f
OSC
oscillation
frequency
OSC clock (ø ) t
OSC OSC
cycle time
System clock (ø) t
cyc
cycle time
Subclock oscilla- f
W
tion frequency
Watch clock (ø ) t
W W
cycle time
Subclock (ø ) t
SUB subcyc
cycle time
Instruction cycle
time
Oscillation t
rc
stabilization time
External clock t
CPH
high width
External clock t
CPL
low width
398
= 1.8 V to 3.6 V, V
CC
Applicable Values
Min Typ
OSC , OSC 2 —
1 2
2 —
OSC , OSC 100 —
1 2
250 —
2 —
— —
DX , DX — 76.8 or
1 2
160
DX , DX — 26.0 or
1 2
12.5
2 —
2 —
OSC , OSC — 20
1 2
— —
DX , DX — —
1 2
OSC 40 —
1
200 —
DX — 6.51 or
1
3.125
OSC 40 —
1
200 —
DX — 6.51 or
1
3.125
= AV = 0.0 V, Ta = –20°C to +75°C
SS SS
Max Unit Test Condition
10 MHz V = 2.7 V to 3.6 V
CC
4 V = 1.8 V to 3.6 V
CC
500 ns V = 2.7 V to 3.6 V
CC
500 V = 1.8 V to 3.6 V
CC
128 t
OSC
208.3 µs
— kHz
— µs
8 t
W
— t
cyc
t
subcyc
45 µs V = 2.2 V to 3.6 V (In
CC
case of Figure 13-8)
50 ms
2.0 s
— ns V = 2.7 V to 3.6 V
CC
— V = 1.8 V to 3.6 V
CC
— µs
— ns V = 2.7 V to 3.6 V
CC
— V = 1.8 V to 3.6 V
CC
— µs
Reference
Figure
Figure 13-1
Figure 13-1
*
Figure 13-8
Figure 13-8
Figure 13-1
Figure 13-1