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FT800 Embedded Video Engine Datasheet

Version 1.4

Document No.: BRT_000039 Clearance No.: BRT#001

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:

REG_GPIO

Bit[6:5]

Bit[4]

Bit[3:2]

Value

00b#

01b

10b

11b

0b#

00b#

01b

10b

11b

Drive

Current

4mA

8mA

12mA

16mA

4mA

8mA

4mA

8mA

12mA

16mA

Pins

GPIO1

GPIO0

PCLK

DISP

VSYNC

HSYNC

R7..R2

G7..G2

B7..B2

BACKLIGHT

MISO

INT_N

Table 4-11 Output drive current selection

Note: #Default value

4.6 Audio Engine

FT800 provides mono audio output through a PWM output pin, AUDIO_L. It outputs the 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 effects end. Some sound effects play continuously until it is interrupted or commanded 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, note value of zero indicates middle C. For other sounds the

high byte of REG_SOUND is ignored.

Value

Pitch adjust

Effect

Value

Pitch adjust

Effect

00h

Silence

32h

DTMF 2

01h

square wave

33h

DTMF 3

02h

sine wave

34h

DTMF 4

03h

sawtooth wave

35h

DTMF 5

04h

triangle wave

36h

DTMF 6

05h

Beeping

37h

DTMF 7

06h

Alarm

38h

DTMF 8

07h

Warble

39h

DTMF 9

08h

Carousel

40h

harp

10h

1 short pip

41h

xylophone

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