MB89990 Просмотр технического описания (PDF) - Fujitsu
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MB89990 Datasheet PDF : 42 Pages
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MB89990 Series
(3) Clock Timing
Parameter
Symbol
Pin
name
Clock frequency
FC
Clock cycle time
tXCYL
Input clock pulse width
PWH
PWL
Input clock pulse
tCR
risilng/falling time
tCF
X0, X1
X0, X1
X0
X0
Condition
—
—
—
—
(VSS = 0.0 V, TA = –40°C to +85°C)
Value
Unit Remarks
Min.
Max.
1
4.2
MHz
238
1000
ns
20
—
ns External clock
—
10
ns External clock
• Timings Conditions
X0
PWH
t CR
t XCYL
0.8 VCC 0.8 VCC
PWL
t CF
0.2 VCC
0.2 VCC
0.2 VCC
• Clock Configurations
When a crystal or ceramic resonator is used
X0
X1
When an external clock is used
X0
X1
Open
(4) Instruction Cycle
Parameter
Instruction cycle
(minimum execution time)
Symbol
tinst
Value (typical)
4/FC
Unit
µs
(VSS = 0.0 V, TA = –40°C to +85°C)
Remarks
tinst = 0.95 µs when operating at
FC = 4.2 MHz
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