ST40RA View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST40RA

32-bit Embedded SuperH Device

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_ BUS_ PER_

CLK CLK CLK

0x000

0x002

0x004

0x008

0x00A

0x00C

0x011

0x013

0x01A

0x01C

0x023

0x02C

0x048

0x04A

0x04C

0x05A

0x05C

0x063

0x06C

0x091

0x093

0x0A3

0x0DA

0x0DC

0x0EC

0x123

0x16C

MODE6

MODE[4:5]

MODE[2:3]

MODE0

MODE1

1/2

1

1

1

1/4

1

1/8

1

1

1/2

1

1/2

1/4

1

1/2

1/8

1

2/3

1/6

1

2/3

1/3

1

1

1/2

1/4

1

1/8

1

1

2/3

1/3

1

1/2

1/8

1

1/4

1

1/2

1/6

1

1/2

1/8

1

1/3

1/6

1

MODE7

1/2

1/4

1/4

1

1/2

1/8

1

1/3

1

1/3

1/6

1/6

1

1/4

1

1/4

1/8

1/8

1

1/4

1

1/8

1

Table 18: Valid FRQCR values and their ratios

1

1/2

1

1/4

1

1/8

1/2

1/2

1/2

1/4

1/2

1/8

2/3

1/6

2/3

1/3

1/2

1/4

1/2

1/8

2/3

1/3

1/2

1/8

1

1/2

1

1/3

1

1/4

2/3

1/6

1/2

1/2

1/2

1/4

1

1/2

1/2

1/2

1

1/2

1/2

1/2

1

1/2

1/2

1/2

ADCS 7260755H

STMicroelectronics 36/94

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