Module rosc

ROSC

Modules

ctrl

Ring Oscillator control

div

Controls the output divider

dormant

Ring Oscillator pause control
This is used to save power by pausing the ROSC
On power-up this field is initialised to WAKE
An invalid write will also select WAKE
Warning: setup the irq before selecting dormant mode

freqa

The FREQA & FREQB registers control the frequency by controlling the drive strength of each stage
The drive strength has 4 levels determined by the number of bits set
Increasing the number of bits set increases the drive strength and increases the oscillation frequency
0 bits set is the default drive strength
1 bit set doubles the drive strength
2 bits set triples drive strength
3 bits set quadruples drive strength

freqb

For a detailed description see freqa register

phase

Controls the phase shifted output

randombit

This just reads the state of the oscillator output so randomness is compromised if the ring oscillator is stopped or run at a harmonic of the bus frequency

status

Ring Oscillator Status

Structs

RegisterBlock

Register block

Type Aliases

CTRL

CTRL (rw) register accessor: Ring Oscillator control

DIV

DIV (rw) register accessor: Controls the output divider

DORMANT

DORMANT (rw) register accessor: Ring Oscillator pause control
This is used to save power by pausing the ROSC
On power-up this field is initialised to WAKE
An invalid write will also select WAKE
Warning: setup the irq before selecting dormant mode

FREQA

FREQA (rw) register accessor: The FREQA & FREQB registers control the frequency by controlling the drive strength of each stage
The drive strength has 4 levels determined by the number of bits set
Increasing the number of bits set increases the drive strength and increases the oscillation frequency
0 bits set is the default drive strength
1 bit set doubles the drive strength
2 bits set triples drive strength
3 bits set quadruples drive strength

FREQB

FREQB (rw) register accessor: For a detailed description see freqa register

PHASE

PHASE (rw) register accessor: Controls the phase shifted output

RANDOMBIT

RANDOMBIT (r) register accessor: This just reads the state of the oscillator output so randomness is compromised if the ring oscillator is stopped or run at a harmonic of the bus frequency

STATUS

STATUS (r) register accessor: Ring Oscillator Status