WM8352 datasheet(184/336 Pages) WOLFSON

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WM8352

Production Data

PD, February 2011, Rev 4.4

184

ALTERNATE

FUNCTION NAME

INPUT /

OUTPUT

DESCRIPTION

/MEMRST

Output

Output used to control other subsystems such as external

memory. Signal goes low to reset external memory. The

status of this signal in the Hibernate state is configurable,

allowing external memory contents to be retained in

Hibernate. See Section 14.

P_CLK

Output

1MHz output clock in phase with the internal DC-DC

converters. This signal can be used to sync external

circuits (e.g. DC-DCs).

POR_B

Output

Output which toggles low to high during power-on reset

PWR_ON

Output

Output used to indicate that device is powered on (eg. to

enable external DC-DC converters). This output is disabled

in the OFF state.

/RST

Output

Output used to indicate system resets. Signal goes low

during reset, same as the /RST pin. The pulse duration is

programmable. See Section 14.

RTC

Output

Real Time Clock output - frequency is controlled by

RTC_DSW[3:0]. See Section 22.

SDOUT

Output

4-wire Control Interface data output pin (SDOUT). Note

that this function is selected automatically on GPIO6 when

4-wire mode is selected, ie. regardless of the GP6_FN

control field. See Section 11.

/VCC_FAULT

Output

Indicates a fault condition on selectable DC Converters,

LDO Regulators and the Limit Switch. The mask bits in

status flag. See Section 14.6.5, Section 14.7.3 and

Section 15.2.3.

VRTC

Output

Output from on-chip backup power source voltage

regulator VRTC.

32kHz

Output

32kHz clock output from the Real Time Clock oscillator.

Table 124 List of GPIO Alternate Functions

20.2.2

SELECTING GPIO ALTERNATE FUNCTIONS

The function of each GPIO pin is programmable by writing to the respective GPn register bits.

GPn_FN = 0000 selects the GPIO function and settings other than 0000 select various alternate

functions.

The GPIO function is also determined by the value of the GPn_DIR register bit. Note that, when

changing GPn_DIR, it is recommended to set GPn_FN = 0000 first.

When changing the function of a GPIO pin, (updating GPn_FN or GPn_DIR), it is recommended that

the following sequence of actions is taken sequentially.



Set GPn_FN = 0000



Update the other GPIO configuration fields GPn_DB, GPn_PU, GPn_PD, GPn_CFG,

GPn_DIR



If the new function is an input, ensure that the input trigger is in the inactive state (ie. logic

0 for a function that is active High)



Set GPn_FN according to the new GPIO function



Read the GPIO Interrupt Status Register R30 (1Eh) to clear any GPIO Interrupt events



If any bit in Register R30 (1Eh) was set when read, then read the System Interrupts

Note that GPIO7 is automatically enabled as CSB in 3-wire and 4-wire control modes. GPIO6 is

automatically enabled as SDOUT in 4-wire control mode. These automatic selections take

precedence over all other GPIO6 and GPIO7 control fields.

WM8352 Datasheet(PDF) 184 Page - Wolfson Microelectronics plc

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