
MB90340E Series
53
4.
AC Characteristics
(1) Clock Timing
(T
A
=
40
°
C to
+
105
°
C, V
CC
=
5.0 V
±
10
%
, f
CP
≤
24 MHz, V
SS
=
AV
SS
=
0 V)
Value
* : When selecting the PLL clock, the range of clock frequency is limited. Use this product within the range as
mentioned in “Relation between the external clock frequency and machine clock frequency”.
Parameter
Symbol
Pin
Unit
Remarks
Min
Typ
Max
Clock frequency
f
C
X0, X1
3
16
MHz
When using an oscillation
circuit
X0, X1
3
24
MHz
When using an external
clock*
f
CL
X0A, X1A
—
32.768
100
kHz
Clock cycle time
t
CYL
X0, X1
62.5
333
ns
When using an oscillation
circuit
X0, X1
41.67
333
ns
When using an external
clock
t
CYLL
X0A, X1A
10
30.5
15.2
8.192
122.1
—
5
μ
s
ns
μ
s
ns
Input clock pulse width
P
WH
, P
WL
X0
10
Duty ratio is about 30
%
to
70
%
.
P
WHL
, P
WLL
X0A
5
1.5
41.67
Input clock rise and fall time
t
CR
, t
CF
X0
When using external clock
Internal operating clock
frequency (machine clock)
f
CP
24
MHz
When using main clock
f
CPL
50
kHz
When using sub clock
Internal operating clock
cycle time (machine clock)
t
CP
666
ns
μ
s
When using main clock
t
CPL
20
When using sub clock
X0
t
CYL
t
CF
t
CR
0.8 V
CC
0.2 V
CC
P
WH
P
WL
X0A
t
CYLL
t
CF
t
CR
0.8 V
CC
0.2 V
CC
P
WHL
P
WLL
Clock Timing