WM9714L datasheet(74/120 Pages) CIRRUS

74 / 120 page

WM9714L

Rev 4.0

The properties of the GPIOs are controlled through registers 4Ch to 52h, as shown below.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4Ch

GCn

GPIO Pin Configuration Control

0 = Output

1 = Input (GC9-15 are always inputs)

4Eh

GPn

GPIO Pin Polarity / Type (Note 1)

Input (GCn = 1)

0 = Active low

1 = Acitve high

0 = Active low

1 = Acitve high

50h

GSn

GPIO Pin Sticky Control

0 = Not sticky

1 = Sticky

52h

GWn

GPIO Pin Wake-up Control

0 = No wake-up (no interrupts generated by

GPIO)

1 = Wake-up (generate interrupts from GPIO)

54h

GIn

N/A

GPIO Pin Status

Read = Returns status of GPIO

Write = Writing 0 clears sticky bits

Table 57 GPIO Control

Note 1: Excludes GP11. For Thermal Sensor Polarity Control (GP11) see Table 40 on page 59.

The following procedure is recommended for handling interrupts:

When the controller receives an interrupt, check register 54h. For each GPIO bit in descending order

of priority, check if the bit is ‘1’. If yes, execute corresponding interrupt routine, then write ‘0’ to

corresponding bit in 54h. If no, continue to next lower priority GPIO. After all GPIOs have been

checked, check if interrupt still present or no. If yes, repeat procedure. If no, then jump back to

process that ran before the interrupt.

If the system CPU cannot execute such an interrupt routine, it may be preferable to switch internal

signals directly onto the GPIO pins. However, in this case the interrupt signals cannot be made sticky,

and more GPIO pins are tied up both on the WM9714L and on the CPU.

WM9714L Datasheet(PDF) 74 Page - Cirrus Logic

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