FT813Q-R datasheet(30/63 Pages) BRIDGETEK

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FT81X Embedded Video Engine Datasheet

Version 1.4

Document No.: BRT_000002 Clearance No.: BRT#004

4.5.4

Pins Drive Current Control

The output drive current of output pins can be changed as per the following table by writing to bit[6:2] of

REG_GPIO register or bit[14:10] of REG_GPIOX register. Alternatively, use the SPI command PINDRIVE

to change the individual pin drive strength.

REG_GPIO

Bit[6:5]

Bit[4]

Bit[3:2]

REG_GPIOX

Bit[14:13]

Bit[12]

Bit[11:10]

Value

00b

01b

10b

11b

0b#

00b#

01b

10b

11b

Drive

Current

10mA

15mA

20mA

5mA

10mA

5mA

10mA

15mA

20mA

Pins

GPIO0

GPIO1

GPIO2

GPIO3

CTP_RST_N

PCLK

DISP

VSYNC

HSYNC

R7..R0

G7..G0

B7..B0

BACKLIGHT

MISO

MOSI

IO2

IO3

INT_N

Table 4-14 Output drive current selection

Note: #Default value

4.6 Audio Engine

FT81x provides mono audio output through a PWM output pin, AUDIO_L. It outputs two audio sources,

the sound synthesizer and audio file playback.

4.6.1

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.

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

Continu

ous

Pitch

adjust

Value

Effect

Continu

ous

Pitch

adjust

00h

Silence

32h

DTMF 2

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