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參數(shù)資料
| 型號： | LM8400 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Four Wire Resistive Touchscreen Controller with Brownout |
| 中文描述： | 四線電阻式觸摸屏控制器掉電 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LM8400 |
4.0 Functional Description
(Continued)
PC
Command
Set max delta
(# of pixels
from
predicted
coordinate)
Set calibration
points
PC
Byte 1
$BC
PC
Byte 2
$00-$3F
TSC
Byte 1
$CA
TSC
Byte 2
$00-$3F
$BD
4.3.3
Advanced
Command
Bytes
Descriptions
$00-$7F
$CA
4.3.3
Advanced
Command
Bytes
Descriptions
$00-$7F
Set minimum
pressure
Toggle
disable/enable
external filter
path
Toggle
disable/enable
self
power-down
Toggle
disable/enable
echo mode
Toggle
disable/enable
pressure
measurements
Toggle
disable/enable
calibration
coordinate
check
Wakeup
Shutdown
Soft reset
TSC Replies
Timeout
Re-send
Self test failed
Self test ok
Acknowledge
Calibration
coordinates
ok
Error / buffer
overrun
Software
version
Data transmit
$BE
$CA
$A0
$CA
$00, $01
$A2
$CA
$00, $01
$A3
$CA
$00, $01
$A4
$CA
$00, $01
$
A5
$CA
$00, $01
$A7
$A8
$AF
$CA
$CA
$CB, $CC
$CF
$CE
$CC
$CB
$CA
$C4
$C8
$C7
$0-$7F
$80/$90 Payload
(3/4 bytes)
4.3.3 Advanced Command Bytes Descriptions
Unless otherwise mentioned, all values are in hex.
$B0: Read clock-speed
Reply Byte #1: $CA (Acknowledge)
Byte #2: Clock readout (0 = 3.3MHz, 1 = 10MHz)
CLK_SEL pin tells the firmware which oscillator speed is
used. If the CLK_SEL input pin is floating or pulled high a
10.0MHz oscillator must be connected. If the pin is pulled
low a 3.3MHz oscillator must be connected. This command
enables the driver software to determine which oscillator
speed is used with the touch screen controller, as this deter-
mines the maximum coordinate pair per second data rates.
Note:
This is available in the LM8500 only.
$B1: Read parameters
Reply Byte #1: $CA (Acknowledge)
Reply Byte #2: First byte in software version number,
year 20 (00-99)
Reply Byte #3: Communication mode (1 = stream, 2 =
touchdown, 4 = liftoff)
Byte #4: Wakeup on touch (0 = disabled, 1 = enabled)
Reply Byte #5: Number of samples (1,2, 4, 8, 16 or
32)
Byte #6: Clock readout (0 = 3.3MHz, 1 = 10MHz)
Byte #7: Second byte in software version number,
month (1-12)
Byte #8: Third byte in software version number, day
(1-31)
Byte #9: Focus value (0-63)
Byte #10: Max delta (0-63)
Byte #11: Number of calibration coordinates (0, 2, 5 or
13)
Byte #12: Toggle-flags:
Bit #5: calibration coordinates check (0=disabled,
1=enabled)
Bit
#4:
Pressure
1=enabled)
Bit #3: Echo mode (0=disabled, 1=enabled)
Bit
#2:
Self
Power-Down
1=enabled)
Bit #1: Unused
Bit #0: External filter path (0=disabled, 1=enabled)
Byte #13: Pressure threshold for valid touch
This command allows the user to read all the selected pa-
rameters. It is primary intended to aid in debugging. This
command can also be used if a configuration utility needs to
determine the current setting of controller.
measurement
(0=disabled,
mode
(0=disabled,
L
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