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TSC2301 TOUCH SCREEN CONTROL REGISTERS

TSC2301 ADC Control Register (Page 1, Address 00H)

TSC2301

SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004

This section describes each of the registers shown in the memory map of Figure 54. The registers are grouped

according to the function they control. In the TSC2301, bits in control registers can refer to slightly different

functions depending upon whether you are reading the register or writing to it. A summary of all registers and bit

locations is shown in Table 4.

The ADC in the TSC2301 is shared between all the different functions. A control register determines which input

is selected, as well as other options. The result of the conversion is placed in one of the result registers in Page

0 of memory, depending upon the function selected.

The ADC control register controls several aspects of the ADC. The register is formatted as follows:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

MSB

LSB

PSM

STS

AD3

AD2

AD1

AD0

RS1

RS0

AV1

AV0

CL1

CL0

PV2

PV1

PV0

Bit 15 — PSM

Pen Status/Control Mode. Reading this bit allows the host to determine if the screen is touched. Writing to this bit

determines the mode used to read coordinates: host controlled or under control of the TSC2301 responding to a

screen touch. When reading, the PENSTS bit indicates if the pen is down or not. When writing to this register,

this bit determines if the TSC2301 controls the reading of coordinates, or if the coordinate conversions are

host-controlled. The default state is host-controlled conversions (0).

Table 5. PSM Bit Operation

PSM

Read/Write

Value

Description

Read

No screen touch detected (default)

Read

Screen touch detected

Write

Conversions controlled by host

Write

Conversions controlled by TSC2301

Bit 14 — STS

ADC Status. Reading this bit indicates if the converter is busy. Writing a 0 to this bit causes the touch screen

scans to continue until either the pen is lifted or the process is stopped. Continuous scans or conversions can be

stopped by writing a 1 to this bit. This immediately halts a conversion (even if the pen is still down) and causes

the ADC to power down. The default state is continuous conversions, but if this bit is read after a reset or

power-up, it reads 1.

Table 6. STS Bit Operation

STS

Read/Write

Value

Description

Read

Converter is busy

Read

Converter is not busy (default)

Write

Normal operation

Write

Stop conversion and power down

TSC2301 Datasheet(PDF) 29 Page - Texas Instruments

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