FT800 Series Programmer Guide
Version 2.1
Document Reference No.: BRT_000030 Clearance No.: BRT#037
45
Copyright © Bridgetek Limited
Register Definition 21
REG_TAG Definition
31
8 7
0
REG_TAG Definition
Address: 0x102478
Reset Value: 0x0
Note: Please note the difference between REG_TAG and REG_TOUCH_TAG. REG_TAG is
updated based on the X,Y given by REG_TAG_X and REG_TAG_Y. However, REG_TOUCH_TAG
is updated based on the current touching point given by FT800 touch engine.
Bit 0 - 7 : These bits are updated with tag value by FT800 graphics engine. The tag value
here is corresponding to the touching point coordinator given in REG_TAG_X and
REG_TAG_Y. Host can read this register to check which graphics object is touched.
Reserved
R/O
Register Definition 22
REG_TAG_Y Definition
31
9 8
0
Address: 0x102474
Reset Value: 0x0
Note: NONE
REG_TAG_Y Definition
Bit 0 - 8 : These bits are set by host as Y coordinate of touching point, which
will enable the host to query the tag value. This register shall be used
together with REG_TAG_X and REG_TAG. Normally, in the case the host has
already captured the touching point's coordinator, this register can be
updated to query the tag value of respective touching point.
Reserved
R/W
