MB90800 Datasheet, PDF (73/88 Pages) Fujitsu Component Limited. – 16-bit Proprietary Microcontroller CMOS

MB90800 Series
4. AC Characteristics
(1) Clock timing
(VCC = AVCC = 3.3 V ± 0.3 V, Ta = − 40 to + 85 °C)
Parameter
Sym
bol
Pin name
Condi-
tions
Min
Value
Typ
Unit
Max
Remarks
fCH X0, X1
3

16
MHz
External crystal
oscillation
Clock frequency
fCH X0, X1
fCL X0A, X1A
Clock cycle time
tHCYL X0, X1
tLCYL X0A, X1A
PWH
PWL
X0

Input clock pulse width
PWLH
PWLL
X0A
Input clock rise time and tcr
fall time
tcf
X0
3

25
At external clock*
4.5

25
Multiply by 1
4
 12.5 MHz Multiply by 2
4
 8.33
Multiply by 3
4
 6.25
Multiply by 4
 32.768  kHz
40

333 ns

30.5

µs
5

 ns Set Duty ratio 50% ± 3%

15.2

µs
Set duty ratio at 30% to
70% as a guideline.


5
ns At external clock
Internal operating clock ^fCP

frequency
fCP1

Internal operating clock ^tCP

cycle time
tCP1

1.5

25
MHz
When main clock is
used
 8.192  kHz When sub clock is used
40

666
ns
When main clock is
used
 122.1  µs When sub clock is used
The Clock timing is based on VSS = AVSS = 0.0 V.
* : When selecting the PLL clock, the range of clock frequency is limited. Use this product within range as mentioned
in “Base oscillator frequency vs. Internal operating clock frequency”.
• X0, X1 clock timing
PWH
tC
0.8 VCC
0.2 VCC
PWL
tcf
tcr
• X0A, X1A clock timing
tCL
0.8 VCC
0.2 VCC
PWLH
PWLL
tcf
tcr
73