WM8310 datasheet(47/291 Pages) WOLFSON

47 / 291 page

Pre-Production

WM8310

PP, May 2012, Rev 3.1

The 32.768kHz oscillator may also be output on a GPIO pin, as described in Section 21. Note that a

GPIO pin configured as 32.768kHz output will continue to output the oscillator clock in the OFF power

state; this may be used to provide clocking to the processor in the OFF state, provided that the

selected power domain for that GPIO pin remains enabled in the OFF state. The CLKOUT output is

always disabled in the OFF power state.

A separate internal RC oscillator generates the required clocks for the integrated DC-DC Converters

on the WM8310. Note that a 2MHz ‘External Power Clock’, derived from this oscillator, may be output

on a GPIO pin to provide synchronised clocking of external DC-DC Converters if required (see

Section 21). The 2MHz External Power Clock is only enabled when either of the External Power

Enable signals EPE1 or EPE2 is asserted. The External Power Enable (EPE) signals are controlled

as described in Section 15.3.

Note that the CLKOUT_ENA control register is locked by the WM8310 User Key. This register can

only be changed by writing the appropriate code to the Security register, as described in Section 12.4.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16528 (4090h)

Clock Control 1

CLKOUT_EN

CLKOUT output enable

0 = Disabled

1 = Enabled

Protected by user key

CLKOUT_OD

CLKOUT pin configuration

0 = CMOS

1 = Open Drain

10:8

CLKOUT_SLO

000

CLKOUT output enable ON slot

select

000 = Do not enable

001 = Enable in Timeslot 1

010 = Enable in Timeslot 2

011 = Enable in Timeslot 3

100 = Enable in Timeslot 4

101 = Enable in Timeslot 5

110 = Do not enable

111 = Do not enable

6:4

CLKOUT_SLP

SLOT

000

CLKOUT output SLEEP slot select

000 = Controlled by CLKOUT_ENA

001 = Disable in Timeslot 5

010 = Disable in Timeslot 4

011 = Disable in Timeslot 3

100 = Disable in Timeslot 2

101 = Disable in Timeslot 1

110 = Controlled by CLKOUT_ENA

111 = Controlled by CLKOUT_ENA

CLKOUT_SR

CLKOUT output source select

0 = FLL output

1 = 32.768kHz oscillator

R16529 (4091h)

Clock Control 2

XTAL_INH

Crystal Start-Up Inhibit

0 = Disabled

1 = Enabled

When XTAL_INH=1, the ‘ON’

transition is inhibited until the

crystal oscillator is valid

XTAL_ENA

Crystal Oscillator Enable

0 = Disabled at all times

1 = Enabled in OFF, ON and

SLEEP states

(Note that the BACKUP behaviour

is determined by

XTAL_BKUPENA.)

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