AR1000_16 Datasheet, PDF (37/61 Pages) Microchip Technology – AR1000 Series Resistive Touch Screen Controller

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
9.3.10 EEPROM_WRITE – 0x29
The controller has 256 bytes of on-board EEPROM.
This command provides a means to write values to the
user space within the EEPROM.
• The first 128 bytes (address range 0x00-0x7F)
are reserved by the controller for the Configura-
tion register settings and calibration data. Only the
Register Write to EEPROM command should be
used to write Configuration registers to EEPROM.
Failure to use the Register Write command to
save Configuration registers to EEPROM may
result in failures or reverting to previously stored
Configuration register values.
• The second 128 bytes (address range
0x80-0xFF) are provided for the user’s
application, if desired.
Warning: ONLY write to user EEPROM addresses of
0x80-0xFF.
One of the following actions is required for
EEPROM changes to be used by the
controller:
• The controller power must be cycled
from OFF to ON or
• Issue the EEPROM_WRITE_TO_REG-
ISTERS command.
Write to EEPROM as follows:
Send: <0x55><0x04 + # EEPROM to
Write><0x29><EEPROM Address High
byte><EEPROM Address Low byte>
<#
of
EEPROM
to
Write><Data>…<Data>
Register Address High byte: 0x00
# of Registers to Read: 0x01 thru 0x08
Receive: <0x55><0x02><Response><0x29>
The AR1000 controller will ignore the value entered for
the EEPROM Address High Byte. However, 0x00 is
recommended to safeguard against any possible future
product development.
9.3.11
EEPROM_WRITE_TO_REGISTERS –
0x2B
Write applicable EEPROM data to Configuration regis-
ters. This will cause the controller to immediately begin
using changes made to EEPROM stored Configuration
register values. A power cycle of the controller will
automatically cause the controller to use changes
made to the EEPROM stored Configuration register
values, without the need for issuing this command. This
command eliminates the need for the power cycle.
Send: <0x55><0x01><0x2B>
Receive: <0x55><0x02><Response><0x2B>
9.3.12 EEPROM MAP
The first 128 bytes in address range 0x00:0x7F are
reserved by the controller for the Configuration register
settings and calibration data. The mapping of data in
this reserved controller space of the EEPROM may
change over different revisions within the product
lifetime.
The EEPROM_WRITE command must not be used to
write directly to the lower 128 bytes of the controller
EEPROM space of 0x00:0x7F.
The second 128 bytes in address range 0x80:0xFF are
provided for the user’s application, if desired.
TABLE 9-6: AR1010/AR1020 EEPROM
AND REGISTER MAP
EEPROM Address
Function
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
<Special Use>
<Special Use>
<Special Use>
Touch Threshold
Sensitivity Filter
Sampling Fast
Sampling Slow
Accuracy Filter Fast
Accuracy Filter Slow
Speed Threshold
<Special Use>
Sleep Delay
Pen-Up Delay
Touch Mode
Touch Options
Calibration Inset
Pen State Report Delay
<Reserved>
Touch Report Delay
<Special Use>
Data Block Separator
Calibration UL X-low
Calibration UL X-high
Calibration UL Y-low
Calibration UL Y-high
Calibration UR X-low
Calibration UR X-high
Calibration UR Y-low
Calibration UR Y-high
Calibration LR X-low
Calibration LR X-high
Calibration LR Y-low
 2009-2016 Microchip Technology Inc.
DS40001393C-page 37