MicroTouch Micro Touch Capacitive Controller MT3000, Справочное руководство, Страница: 40 / 64

MT3000 Capacitive Controller Reference Guide 40
where:
S = Status byte; first byte of data. Refer to Table 6.
Xx = X (horizontal) coordinate data; second and third bytes of data
Yy = Y (vertical) coordinate data; fourth and fifth bytes of data.
MSB* Bits LSB*
Data Sequence 7 6 5 4 3 2 1 0
S - Byte 1 1 S6 Reserved
X - Byte 2 0 X3 X2 X1 X0 Reserved
x - Byte 3 0 Xs** X9 X8 X7 X6 X5 X4
Y - Byte 4 0 Y3 Y2 Y1 Y0 Reserved
y - Byte 5 0 Ys** Y9 Y8 Y7 Y6 Y5 Y4
* MSB = Most Significant Bit, LSB = Least Significant Bit
** s = sign bit
Table 6 describes the meaning of the bits in the status byte (Byte 1).
Table 6. Calibrate Raw Status Bits
Bit Description Values
S0 – S5 Reserved —
S6 Proximity
(touch state) 1 = Touchscreen is being touched (a
touchdown or a continued touch).
0 = Touchscreen is not being touched (a
touch liftoff or inactive).
When the proximity bit changes from 1 to 0
(touch liftoff), the controller outputs one
final set of X/Y coordinate data with the bit
equal to 0 and the X/Y coordinate data equal
to the last touch point.
S7 Packet
synchronization Always 1.