BT818Q-R datasheet(28/59 Pages) BRIDGETEK

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BT817/8 Advanced Embedded Video Engine Datasheet

Version 1.1

Document No.: BRT_000302 Clearance No.: BRT#154

Yes

extsync mode, 2X pixels

Yes

framerate

extsync, 2X, adaptive framerate

Yes

hsync

extsync, 2X, adaptive hsync

Yes

not supported

Table 4-15 Display mode

4.6 Miscellaneous Control

4.6.1

Backlight Control Pin

The backlight dimming control pin (BACKLIGHT) is a Pulse-width Modulation (PWM) signal controlled

by two registers: REG_PWM_HZ and REG_PWM_DUTY. REG_PWM_HZ specifies the PWM output

frequency, the range is 250-10000 Hz. REG_PWM_DUTY specifies the duty cycle; the range is 0-128.

A value of 0 means that the PWM is completely off and 128 means completely on.

The BACKLIGHT pin will output low when the DISP pin is not enabled (i.e. logic 0).

4.6.2

DISP Control Pin

The DISP pin is a general purpose output that can be used to enable, or reset the LCD display panel.

The pin is controlled by writing to Bit 7 of the REG_GPIO register, or bit 15 of REG_GPIOX.

4.6.3

General Purpose IO pins

The BT817/8 can be configured to use up to 4 GPIO pins. These GPIO pins are controlled by the

REG_GPIOX_DIR and REG_GPIOX registers. Alternatively the GPIO0 and GPIO1 pins can also be

controlled by REG_GPIO_DIR and REG_GPIO to maintain backward compatibility with the

FT800/FT801.

When the QSPI is enabled in Quad mode, GPIO0/IO2 and GPIO1/IO3 pins are used as data lines of the

QSPI.

4.6.4

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

Drive

Strength

Degree

DSD1

DSD2

DSD3

DSD4

DSD1

DSD2

DSD1

DSD2

DSD3

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

SPIM_SCLK

SPIM_SS_N

SPIM_MOSI

SPIM_MISO

SPIM_IO2

SPIM_IO3

Table 4-16 Output Drive Current Selection

Note: #Default value

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