FT810Q datasheet(20/60 Pages) FTDI

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Document No.: FT_001165

FT81X

Embedded Video Engine

Datasheet Version 1.2

Clearance No.:

FTDI#440

1st Byte

2nd byte

3rd byte

Command

Description

Pull-Up

Reserved

Byte2[7:2] determine which pin/pin group

to set.

Please refer to the table in command

PINDRIVE entry.

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

4.1.6 Interrupts

The interrupt output pin is enabled by REG_INT_EN. When REG_INT_EN is 0, INT_N is tri-state (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 corresponding 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.

The INT_N pin is open-drain (OD) output by default. It can be configured to push-pull output by register

REG_GPIOX.

Table 4-6 Interrupt Flags bit assignment

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 detected

Display list swap

occurred

4.2 System Clock

4.2.1 Clock Source

The FT81x can be configured to use any of the three clock sources for system clock:



Internal relaxation oscillator clock (default)



External 12MHz crystal



External 12MHz square wave clock

Figure 4-4, Figure 4-5 and Figure 4-6 show the pin connections for these clock options.

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