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PM0222

Clock configurations

3.2.2

CPU clock table

To allow fine tuning between computing performance and power consumption, Brain

provides numerous CPU clock configurations as listed in Table 4.

Table 4. CPU clock programming

CPU frequency

Configuration(1)

1. * = may be used to select other functionality / x = unused in this configuration

80 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**0011xxxx

40 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**00010000

26.666 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**0010xxxx

20 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**00010010

16 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**0000xxxx

13.333 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**00010011

10 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**00010100

8 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**00010101

5 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**00010110

4 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**00010111

2.5 MHz

CRMU.CCR0[ 12 : 0 ] = 0b1*0**00011000

32 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***10111xxxx

16 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***101010000

10.666 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***10110xxxx

8 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***101010010

6.4 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***10100xxxx

5.333 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***101010011

4 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***101010100

3.2 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***101010101

2 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***101010110

1.6 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***101010111

1 kHz

CRMU.CCR0[ 12 : 0 ] = 0b1***101011000

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