WM8753 Wolfson Microelectronics plc, WM8753 Datasheet - Page 49

• Manufacturer Part Number: WM8753
• Description: HI FI AND TELEPHONY DUAL CODEC
• Manufacturer: Wolfson Microelectronics plc

WM8753L
w
Figure 14 Interrupt Control Flowchart
Set HPSWIPOL in
Invert HPSWIPOL
Write R27/R28 to
Set HPSWIEN in
Clear HPSWIEN
source enabled)
configure GPIO
Set HPSWIEN
interrupt mode
Read interrupt
(when multiple
HOST
Read device
status [SR5]
status [SR4]
register R25
register R26
Host enters
(optional)
INT pin
SR_IHPDET will be set if
interrupt caused by
headphones.
SR_HPDET will indicate
the current status of the
headphones.
This flowchart illustrates headphone detection,
The interupt controller in the WM8753 is level
sensitive, ensuring that interupts are always
but the same principle applies to the other
headphones already connected
detected even without a clock.
user connects headphones or
WM8753
when headphones
interrupt sources.
Will now interrupt
deactivated if no
other interrupts
interrupt when
INT virtual pin
disconnected
WM8753 will
headphones
connected
activated
INT pin
headphones already disconnected
user disconnects headphones or
AI Rev 3.1 June 2004
Advanced Information
49