MB91305 Datasheet, PDF (58/90 Pages) Fujitsu Component Limited. – 32-bit Microcontroller

MB91305
4. AC Characteristics
(1) Clock timing ratings
(VDDI = 1.8 V ± 0.15 V, VDDE = AVCC = 3.3 V ± 0.3 V, VSS = AVSS = 0 V, Ta = −10 °C to +70 °C)
Parameter
Symbol Pin
Condi-
tions
Value
Min
Max
Unit
Remarks
Clock frequency (1)
Clock cycle time
Clock frequency (2)
Clock frequency (3)
fC
X0
X1
⎯
tC
X0
X1
fC
X0
X1
fC
X0
X1
37.5
12.5
⎯
⎯
10
10
48
MHz
16
20.8
MHz
Using PLL*¹
ns
62.5
ns
50
MHz
Self-oscillation
(1/2 division input)
50
MHz
Clock cycle time
tC
X0
X1
Input clock pulse width
PWH
PWL
X0
X1
Input clock rise time
and fall time
tCR
X0
tCF
X1
fCP
Internal operating clock
frequency
fCPP
⎯
fCPT
tCP
Internal operating clock
cycle time
tCPP
⎯
tCPT
⎯
40
100
ns At external clock
16
⎯
ns
⎯
8
ns tCR + tCF
3.125*²
64
MHz CPU
⎯
3.125*²
32
MHz Peripheral
3.125*²
32
MHz External bus
15.6
1280*²
ns CPU
⎯
31.2
1280*²
ns Peripheral
31.2
1280*²
ns External bus
*1 : This value is as follows;
- With USB function (MD pin = 0000B) : 37.5 MHz to 48 MHz And using USB: fixed to 48 MHz
(operation at a maximum internal speed of 64 MHz by
quadrupling a self-oscillation frequency of 48 MHz via PLL of
divided by 3.)
- Without USB function (MD pin = 0010B) : 12.5 MHz to 16 MHz
(operation at a maximum internal speed of 64 MHz by
quadrupling a self-oscillation frequency of 16 MHz via PLL.)
*2 : The values shown represent a minimum clock frequency of 12.5 MHz input at the X0 pin, using the oscillation
circuit PLL and a gear ratio of 1/16.
12.5 [MHz] × 4 (multiply) × 1/16 (gear 1/16) = 3.125 [MHz]
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