TSC2005 datasheet(24/46 Pages) TI2

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COMMUNICATION PROTOCOL

Configuration Register 0

TSC2005

SBAS379C – DECEMBER 2006 – REVISED MARCH 2008

The TSC2005 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 10 are all 16-bit, right-adjusted. NOTE: Except for some configuration registers and the

Status register that are full 16-bit registers, the value registers are 12-bit (or 10-bit) data preceded by four (or six)

zeros.

Table 11. Configuration Register 0 (Reset Value = 4000h for Read; 0000h for Write)

MSB

LSB

D15

D14

D13

D12

D11

D10

PSM

STS

CL1

CL0

PV2

PV1

PV0

PR2

PR1

PR0

SN2

SN1

SN0

DTW

LSM

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 TSC2005 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 TSC2005 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 TSC2005 to initiate and control the scan function for XYZ or XY when

a pen touch is detected.

Table 12. 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 TSC2005

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.

Table 13. 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

RM—Resolution control. The A/D converter resolution is specified with this bit. See Table 14 for a description of

these bits. This bit is the same whether reading or writing, and defaults to 0. Note that the same bit can be

written through Control Byte 1.

Table 14. A/D Converter Resolution Control

FUNCTION

10-bit resolution. Power-up and reset default.

12-bit resolution

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