MB90F883AS datasheet(49/75 Pages) FUJITSU

49 / 75 page

MB90880 Series

3.6

2.7

3.0

1.5

3 4

12.5

1.5

5 6

Normal operating range

Internal clock fCP (MHz) *4

Internal operating clock frequency vs. Supply voltage

PLL warranted operating range

Source oscillator frequency vs. Internal operating clock frequency

Source oscillator clock FCH (MHz)

• PLL warranted operating range

Notes:

• Use the fCP at 4 MHz or higher only for PLL1 multiplication.

• For A/D operating frequencies, refer to “5. A/D Converter electrical characteristics”.

*1 :

When using the internal clock at “20 MHz

< fCP ≤ 25 MHz” in PLL1, 2, 3 or 4 multiplication setting, set both of

the DIV2 and PLL2 bits to “1” in the PLLOS register.

Example :

When the source oscillator frequency is 24 MHz in PLL1 multiplication :

CKSCR register : CS1

= “0”, CS0 = “0”

PLLOS register : DIV2

= “1”, PLL2 = “1”

Example :

When the source oscillator frequency is 6 MHz in PLL3 multiplication :

CKSCR register : CS1

= “1”, CS0 = “0”

PLLOS register : DIV2

= “1”, PLL2 = “1”

*2 :

When using the internal clock at “20 MHz

< fCP ≤ 25 MHz” in PLL 2 or 4 multiplication setting, the following

settings can also be used.

PLL2 multiplication : CKSCR register : CS1

= “0”, CS0 = “0”

PLLOS register : DIV2

= “0”, PLL2 = “1”

PLL4 multiplication CKSCR register : CS1

= “0”, CS0 = “1”

PLLOS register : DIV2

= “0”, PLL2 = “1”

*3 :

When using the PLL6 or 8 multiplication setting, set DIV2 to “0” and PLL2 to “1” in the PLLOS register.

Example :

When the source oscillator frequency is 4 MHz in PLL6 multiplication :

CKSCR register : CS1

= “1”, CS0 = “0”

PLLOS register : DIV2

= “0”, PLL2 = “1”

Example :

When the source oscillator frequency is 3 MHz in PLL8 multiplication :

CKSCR register : CS1

= “1”, CS0 = “1”

PLLOS register : DIV2

= “0”, PLL2 = “1”

*4 :

The maximum operating frequency of MB90F883(S) and MB90F884(S) is 25 MHz.

8 Multi-

plication*3

No multiplication

6 Multi-

plica-

tion*3

3 Multi-

plication*1

4 Multi-

plica-

tion

*1, *2

2 Multi-

plication*1, *2

1 Multiplication*1

MB90F883AS Datasheet(PDF) 49 Page - fujitsu semiconductor

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