參數(shù)資料
型號： STV8237
廠商： 意法半導(dǎo)體
英文描述： Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
中文描述： 數(shù)字音頻解碼器/處理器為A2和麗音電視/錄像機
文件頁數(shù)： 44/149頁
文件大小： 2775K
代理商： STV8237
Additional Controls and Flag
STV82x7
44/149
9
Additional Controls and Flag
This logic contains:
●
the headphone detection,
●
the IRQ generation, signal to be output to the MCU,
●
the I2C bus expander output pin.
9.1
Headphone Detection
For headphone, the HP_DET input can be used to automatically mute the Loudspeakers and
Subwoofer outputs when the HP_LS_MUTE bit is set in register
HEADPHONE_CONFIG
(active
low). When a headphone is detected (the HP_DET pin is set to 0) and the Mute function is enabled.
Each change on the HP_DET pin generates an IRQ request to the microprocessor on the IRQ pin.
9.2
IRQ Generation
Four IRQs are generated by the STV82x7. On each IRQ generation, the IRQ pin is set to 1. The
pending IRQ status must be read at the I22S address 81h and the acknowledge is done by writing 0
to this register.
The four availables IRQs are:
IRQ0
: The identified TV sound standard is displayed in register
AUTOSTD_STATUS
. Each change
in the detected standard is flagged to the host system via hardware pin IRQ. The flag must be reset
by re-programming the IRQ bit in register
AUTOSTD_CTRL
and then checking the detected
standard status by reading registers
AUTOSTD_STATUS
,
NICAM_STAT
, and
ZWT_STAT
.
IRQ1
: This IRQ is enabled only in digital input mode. In case of I2S synchronisation loss, this IRQ is
set to 1.
IRQ2
: This IRQ is set to 1 when the device detects any change on the HP Detection pin
(Headphone connection or deconnection).
IRQ3
: On the STV82x7, same pins are used for both Headphone and Surround loudspeaker signal
output. A change in the Headphone configuration (HP active or not active) will lead to a signal
switch on those hardware pins. In order to ensure a smooth audio transition, the output is soft muted
before the signal is switched. The IRQ3 is then set to 1 to advise the master processor that the
signal has been switched and to request a HP/Srnd Ouput Un-Mute.
9.3
I2C Bus Expander
Pin BUS_EXP can be used to control external switchable IF SAW filters or audio switches. This pin
can be directly programmed by register
RESET
.
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