# RTL8722DM LCDC MCU 16bit doesn't work

**URL:** <https://forum.amebaiot.com/t/rtl8722dm-lcdc-mcu-16bit-doesnt-work/696>\
**Category:** Peripherals\
**Tags:** lcdc, rtl872xd\
**Created:** [July 30, 2021, 7:15am UTC](https://forum.amebaiot.com/t/rtl8722dm-lcdc-mcu-16bit-doesnt-work/696 "2021-07-30T07:15:39Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![lhxzui](https://avatars.discourse-cdn.com/v4/letter/l/b9bd4f/32.png) [@lhxzui](https://forum.amebaiot.com/u/lhxzui)\
**Post date:** [July 30, 2021, 7:15am UTC](https://forum.amebaiot.com/t/rtl8722dm-lcdc-mcu-16bit-doesnt-work/696/1 "2021-07-30T07:15:40Z")

</div>

IDE is IAR.  
SDK is the newest from github.  
I test LCDC MCU\_trigger\_DMA in ambd\_sdk\project\realtek\_amebaD\_va0\_example\example\_sources\LCDC.  
If MCULCDBitMode is configured MCU\_LCD\_16BIT\_IF, the screen shows random code.  
If MCULCDBitMode is configured MCU\_LCD\_8BIT\_IF, the screen is displayed correctly.  
Does someone use LCDC in 16bit mode?

---

<div class="post-metadata">

**Author:** ![xidameng](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/xidameng/32/18_2.png) [@xidameng](https://forum.amebaiot.com/u/xidameng)\
**Post date:** [July 30, 2021, 11:15am UTC](https://forum.amebaiot.com/t/rtl8722dm-lcdc-mcu-16bit-doesnt-work/696/2 "2021-07-30T11:15:43Z")

</div>

Any info about the model of the LCD display used?

---

<div class="post-metadata">

**Author:** ![lhxzui](https://avatars.discourse-cdn.com/v4/letter/l/b9bd4f/32.png) [@lhxzui](https://forum.amebaiot.com/u/lhxzui)\
**Post date:** [July 30, 2021, 11:28am UTC](https://forum.amebaiot.com/t/rtl8722dm-lcdc-mcu-16bit-doesnt-work/696/3 "2021-07-30T11:28:33Z")

</div>

IPS display. IC is ILI9481. 320 \* 480.  
The display works well.

---

<div class="post-metadata">

**Author:** ![wyy](https://avatars.discourse-cdn.com/v4/letter/w/bc8723/32.png) [@wyy](https://forum.amebaiot.com/u/wyy)\
**Post date:** [July 30, 2021, 3:57pm UTC](https://forum.amebaiot.com/t/rtl8722dm-lcdc-mcu-16bit-doesnt-work/696/4 "2021-07-30T15:57:22Z")

</div>

LCDC MCU 16-bit mode is not supported for RTL8722DM, only 8-bit mode is supported

---

<div class="post-metadata">

**Author:** ![lhxzui](https://avatars.discourse-cdn.com/v4/letter/l/b9bd4f/32.png) [@lhxzui](https://forum.amebaiot.com/u/lhxzui)\
**Post date:** [August 2, 2021, 12:40am UTC](https://forum.amebaiot.com/t/rtl8722dm-lcdc-mcu-16bit-doesnt-work/696/5 "2021-08-02T00:40:49Z")

</div>

Thank you very much.