TSC2014IYZGR datasheet(42/62 Pages) TI2

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TSC2014

SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016

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7.6.4 Communication Protocol

The TSC2014 is controlled entirely by registers. Reading and writing to these registers are accomplished by the

use of Control Byte 0, which includes a 4-bit address plus one read/write TSC register control bit. The data

registers defined in Table 7 are all 16-bit, right-adjusted.

NOTE

Except for some configuration registers and the Status register that are full 16-bit

registers, the rest of the value registers are 12-bit (or 10-bit) data preceded by four (or six)

zeros.

7.6.4.1 Configuration Register 0

Figure 39. Configuration Register 0 (Reset Value = 4000h for Read; 0000h for Write)

MSB

D15

D14

D13

D12

D11

D10

LSB

PSM

STS

CL1

CL0

PV2

PV1

PV0

PR2

PR1

PR0

SN2

SN1

SN0

DTW

LSM

7.6.4.1.1

PSM

Pen status/control mode. Reading this bit allows the host to determine if the screen is touched. Writing to this bit

selects the mode used to control the flow of converter functions that are either initiated and/or controlled by host

or under control of the TSC2014 responding to a pen touch. When reading, the PSM bit indicates if the pen is

down or not. When writing to this register, this bit determines if the TSC2014 controls the converter functions, or

if the converter functions are host-controlled. The default state is the host-controlled converter function mode (0).

The other state (1) is the TSC-initiated scan function mode that must only collaborate with C3-C0 = 0000 or 0001

in order to allow the TSC2014 to initiate and control the scan function for XYZ or XY when a pen touch is

detected.

Table 11. PSM Bit Operation

OPERATION

VALUE

DESCRIPTION

Read

No screen touch detected

Read

Screen touch detected

Write

Converter functions initiated and/or controlled by host

Write

Converter functions initiated and controlled by the TSC2014

7.6.4.1.2

STS

A/D converter status. When reading, this bit indicates if the converter is busy or not busy. Continuous scans or

conversions can be stopped by writing a '1' to this bit, immediately aborting the running converter function (even

if the pen is still down) and causing the A/D converter to power down. The default state for write is 0 (normal

operation), and the default state for read is 1 (converter is not busy). NOTE: The same bit can be written through

Control Byte 1. This bit is self-clearing.

Table 12. STS Bit Operation

OPERATION

VALUE

DESCRIPTION

Read

Converter is busy

Read

Converter is not busy

Write

Normal operation

Write

Stop converter function and power down

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