FT800Q-R datasheet(14/46 Pages) BRIDGETEK

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FT800 Embedded Video Engine Datasheet

Version 1.4

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

For I2C command transaction, bytes are packed in the I2C protocol as follows:

[start] <DEVICE ADDRESS + write bit>

<01b,Command[5:0]>

<00h>

<00h> [stop]

1st Byte

2nd byte

3rd byte

Command

Description

Power Modes

00000000b

00h

ACTIVE

Switch from Standby/Sleep modes to

active mode. Dummy read from address

0 generates ACTIVE command.

01000001b

00000000b

41h

STANDBY

Put FT800 core to standby mode. Clock

gate off, PLL and Oscillator remain on

(default).

01000010b

00000000b

42h

SLEEP

Put FT800 core to sleep mode. Clock

gate off, PLL and Oscillator off.

01010000b

00000000b

50h

PWRDOWN

Switch off 1.2V internal regulator. Clock,

PLL and Oscillator off.

Clock Switching

01000100b

00000000b

00000000bN

44h

CLKEXT

Enable PLL input from Crystal oscillator

or external input clock.

01100010b

00000000b

00000000bN

62h

CLK48M

Switch PLL output clock to 48MHz

(default).

01100001b

00000000b

61h

CLK36M

Switch PLL output clock to 36MHz.

Miscellaneous

01101000b

00000000b

68h

CORERST

Send reset pulse to FT800 core. All

registers and state machines will be

reset.

Table 4-4 Host Command Table

Note: Any command code not specified is reserved and should not be used by the software

4.1.7

Interrupts

The interrupt output pin is enabled by REG_INT_EN. When REG_INT_EN is 0, INT_N is tristate (pulled to

high by external pull-up resistor). When REG_INT_EN is 1, INT_N is driven low when any of the interrupt

flags in REG_INT_FLAGS are high, after masking with REG_INT_MASK. Writing a ‘1’ in any bit of

REG_INT_MASK will enable the correspond interrupt. Each bit in REG_INT_FLAGS is set by a

corresponding interrupt source. REG_INT_FLAGS is readable by the host at any time, and clears when

read.

When the FT800 is in sleep mode, a touch event detected on the touch-screen will drive the INT_N pin to

low regardless the setting of REG_INT_EN and REG_INT_MASK. The MCU can use this signal to serve as

a wakeup event.

Bit

Interrupt Sources

CONVCOMPLETE

CMDFLAG

CMDEMPTY

PLAYBACK

Conditions

Touch-screen

conversions

completed

Command FIFO

flag

Command FIFO

empty

Audio playback

ended

Bit

Interrupt Sources

SOUND

TAG

TOUCH

SWAP

Conditions

Sound effect

ended

Touch-screen tag

value change

Touch-screen

touch detected

Display list swap

occurred

Table 4-5 Interrupt Flags bit assignment

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