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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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BT817AQ-R Fiches technique(PDF) 29 Page - Bridgetek Pte Ltd. |
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BT817AQ-R Fiches technique(HTML) 29 Page - Bridgetek Pte Ltd. |
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29 / 58 page  Copyright © Bridgetek Pte Ltd 29 BT817A Automotive Advanced Video Engine Datasheet Version 1.0 Document No.: BRT_000251 Clearance No.: BRT#194 Pins GPIO0 GPIO1 GPIO2 GPIO3 CTP_RST_N PCLK DISP VSYNC HSYNC DE R7..R0 G7..G0 B7..B0 BACKLIGHT MISO MOSI IO2 IO3 INT_N SPIM_SCLK SPIM_SS_N SPIM_MOSI SPIM_MISO SPIM_IO2 SPIM_IO3 Table 4-16 Output Drive Current Selection Note: #Default value 4.7 Audio Engine BT817A provides mono audio output with sigma-delta modulation through a digital output pin, AUDIO_L. It outputs two audio sources, the sound synthesizer and audio file playback. 4.7.1 Sound Synthesizer A sound processor, AUDIO ENGINE, generates the sound effects from a small ROM library of waves table. To play a sound effect listed in Table 4.3, load the REG_SOUND register with a code value and write 1 to the REG_PLAY register. The REG_PLAY register reads 1 while the effect is playing and returns a ‘0’ when the effect ends. Some sound effects play continuously until interrupted or instructed to play the next sound effect. To interrupt an effect, write a new value to REG_SOUND and REG_PLAY registers; e.g., write 0 (Silence) to REG_SOUND and 1 to PEG_PLAY to stop the sound effect. Note that the audio engine will automatically start upon chip boot up, and the AUDIO_L pin will output a carrier signal at a frequency equal to half of the system clock. To avoid the carrier wave being output on the pin when audio is not used, play the mute sound (write 0x60 to REG_SOUND and 1 to REG_PLAY). The AUDIO_L pin will then output a logic low level. The sound volume is controlled by register REG_VOL_SOUND. The 16-bit REG_SOUND register takes an 8-bit sound in the low byte. For some sounds, marked "pitch adjust" in the table below, the high 8 bits contain a MIDI note value. For these sounds, a note value of zero indicates middle C. For other sounds, the high byte of REG_SOUND is ignored. Value Effect Conti nuous Pitch adjus t Value Effect Conti nuous Pitch adjus t 00h Silence Y N 32h DTMF 2 Y N 01h square wave Y Y 33h DTMF 3 Y N 02h sine wave Y Y 34h DTMF 4 Y N 03h sawtooth wave Y Y 35h DTMF 5 Y N 04h triangle wave Y Y 36h DTMF 6 Y N 05h Beeping Y Y 37h DTMF 7 Y N 06h Alarm Y Y 38h DTMF 8 Y N 07h Warble Y Y 39h DTMF 9 Y N 08h Carousel Y Y 40h harp N Y 10h 1 short pip N Y 41h xylophone N Y 11h 2 short pips N Y 42h tuba N Y 12h 3 short pips N Y 43h glockenspiel N Y 13h 4 short pips N Y 44h organ N Y |
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