Hitachi H8/3152, Hardware Manual

Page: 111 / 138

112
12.2.4 AC Characteristics (5 V, CPU operates at the external clock frequency)
Conditions: V
CC
= 4.5 to 5.5 V, V
SS
= 0 V, T
a
= –25 to +85
°
C, unless otherwise specified.
Item Symbol Min Typ Max Unit Test Conditions
Clock cycle time t
cyc
0.2 — 1.0
µ
s Figure 12.1
Clock high width t
CH
0.4 — 0.6 t
cyc
Figure 12.1
Clock low width t
CL
0.4 — 0.6 t
cyc
Figure 12.1
Clock fall time t
Cf
— — 0.09* t
cyc
Figure 12.1
Clock rise time t
Cr
— — 0.09* t
cyc
Figure 12.1
I/O port input fall time t
f
— — 1.0
µ
s Figure 12.2
I/O port input rise time t
r
— — 1.0
µ
s Figure 12.2
RES pulse width t
RWL
20 — — t
cyc
Figure 12.3
Power-on time t
on
0 — — ms Figure 12.3
Power-off time t
off
0 — — ms Figure 12.3
EEPROM write time t
EPW
— — 10 ms Rewrite
— — 5 ms Erase, overwrite
Clock hold time t
CLKH
20 — — t
cyc
Figure 12.4
Clock setup time t
CLKS
20 — — t
cyc
Figure 12.4
Interrupt pulse width (
IRQ
) t
IRQW
200 — — ns Figure 12.4
Note: * It is assumed that there is no noise on the CLK pin, and the rise and fall of CLK are
straightforward.
CLK
0.5 V
V
CC
×
0.7
t
CH
t
Cr
t
cyc
V
CC
×
0.7
0.5 V
t
Cf
t
CL
0.5 V
Figure 12.1 CLK Input Waveform (V
CC
= 4.5 V to 5.5 V)