Intermec CK30 Service Manual page 56

Chapter 4 — Theory of Operation
HCR Output Signal Descriptions (continued)
HCR Bit Function
U16 20 CF_RESET
U16 21 USB_EN
U16 22 LCD VEE_EN
U16 23 BKLT_ON
U11 0 BKLT_LOW
U11 1 DOCK_EN
U11 2 DISPLAY_EN
U11 3 TRIG_AIM*
U11 4 SCAN_PWR_EN*
U11 5 SCAN_12C_EN*
U11 6 LASEN
U11 7 -FPGA_RESET
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Signal Description
Compact Flash slot 0 Reset (unused in CK30).
Enables pull-up on USB bus to acknowledge host and start
communications. This can be used to hold off USB
communications until the USB driver is ready, or to disconnect a
USB session in progress (simulated cable disconnect).
LCD bias supply enable.
Backlight On/Off control.
Backlight level.
Enables RS-232 communications through the 26-pin dock port.
Also used to switch tethered scanner power to dock connector.
This should be turned off on Suspend unless the computer has
been configured to support trigger-resume on a tethered scanner
plugged into the dock port.
High enables LCD module logic.
2D imager usage: aiming LED control.
S9C decoder usage: Trigger signal.
EV10 usage: 1D/2D select.
SE900 usage: spotter beam.
SE900HS usage: 1D/2D.
Tethered scanner usage: Auto-detect enable/disable.
E2010 usage: Reset.
Scanner power control.
This should be turned off on Suspend unless the computer has
been configured to support trigger-resume on a tethered scanner
plugged into the 10-pin port.
U34 gate control to isolate the 2D imager from the I2C bus
when it is powered down.
Originally defined as a scanner control signal, this HCR output
is now unused. Its function was moved to the FPGA.
Reset the FPGA logic and FIFOs.
Usage
0 = idle
1 = reset
0 = USB
disconnect
1 = USB connect
0 = off
1 = on
0 = off
1 = on
0 = high
1 = low
0 = disable dock
serial and tethered
power
1 = enable dock
serial and tethered
power
0 = LCD logic off
1 = LCD logic on
1 = Aim
0 = Trigger
0 = 1D and 2D
1 = 1D
0 = Aim
0 = 2D
1 = 1D
0 = enable auto-
detect
0 = reset
0 = scanner power
on
1 = scanner power
off
0 = imager
1 = imager
N/A
0 = reset
1 = idle
CK30 Handheld Computer Service Manual
isolated from
I2C bus
connected to
I2C bus