ST40RA datasheet(36/94 Pages) STMICROELECTRONICS

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ADCS 7260755H

STMicroelectronics

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ST40RA

6 Clock generation

6.4

Setting clock frequencies

Table 18 shows valid FRQCR ratios and the associated clock frequencies for derived clocks.

CLOCKGENA.FRQCR and

CLOCKGENB.FRQCR

ST40RA codified ratios

Clock ratios

Lower 9 bit

Available

on start up

CPU_

CLK

BUS_

CLK

PER_

CLK

CPU_

CLK

BUS_

CLK

PER_

CLK

0x000

1/2

0x002

1/4

0x004

1/8

0x008

MODE6

1/2

0x00A

MODE[4:5]

1/4

1/2

1/4

0x00C

1/2

1/8

1/2

1/8

0x011

2/3

1/6

2/3

1/6

0x013

MODE[2:3]

2/3

1/3

2/3

1/3

0x01A

MODE0

1/2

1/4

1/2

1/4

0x01C

1/8

1/2

1/8

0x023

MODE1

2/3

1/3

2/3

1/3

0x02C

1/2

1/8

1/2

1/8

0x048

1/2

1/4

1/2

0x04A

1/6

1/3

0x04C

1/8

1/4

0x05A

1/3

1/6

2/3

1/6

0x05C

0x063

MODE7

1/2

1/4

1/2

0x06C

1/2

1/8

1/2

1/4

0x091

1/3

1/6

1/2

0x093

0x0A3

1/6

1/2

0x0DA

1/4

1/8

1/2

0x0DC

0x0EC

1/8

1/2

0x123

1/4

1/2

0x16C

1/8

1/2

Table 18: Valid FRQCR values and their ratios

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