MicroTouch Micro Touch Capacitive Controller MT3000, Reference Manual, Page: 24 / 64

MT3000 Capacitive Controller Reference Guide 24
Controller Default Settings
This section describes the default settings for the MT3000 controller.
Communication Parameters
The default operation of the MT3000 controller is N, 7, 2 (no parity, 7 data
bits, and 2 stop bits) at 9600 baud. It also can be programmed to work with
even/odd parity, 8 data bits, and 1 or 2 stop bits.
Data Format
Data format refers to the type of packet the controller uses to send the X/Y
touch coordinates to the host system.
Format Decimal is the default format for the MT3000 controller operating
at 7 data bits. Format Decimal is provided for compatibility with older
designs,
however MicroTouch recommends that you use Format Tablet for
current development because:
•
Format Tablet uses only 5 bytes per point and provides the most rapid
response time to a touch.
•
It is the most efficient and most compact data format, sending
approximately 192 packets per second at 9600 baud.
•
Format Tablet includes a status byte. The status byte contains
information on whether the X/Y coordinate is generated from a
touchdown, a touch continuation (when the finger is resting on the
screen), or a touch liftoff.
•
Format Tablet is supported by all current MicroTouch touchscreen
controllers.
•
It is the standard for current MicroTouch product development and is
the format used by all touchscreen drivers written by MicroTouch.
To use Format Tablet, you must reinitialize the controller to N, 8, 1. See the
initialization instructions in the following section: Communicating With the
Controller.
Refer also to the Format Tablet command in the firmware reference section
that follows.