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2-12 Intel® PXA255 Processor Developer’s Manual
System Architecture
L_DD[13]/
GPIO[71]
ICOCZ
LCD display data. (output) Transfers pixel information
from the LCD Controller to the external LCD panel.
3.6864 MHz clock. (output) Output from 3.6864 MHz
oscillator.
Pulled High -
Note[1]
Note [3]
L_DD[14]/
GPIO[72]
ICOCZ
LCD display data. (output) Transfers pixel information
from the LCD Controller to the external LCD panel.
32 kHz clock. (output) Output from the 32 kHz oscillator.
Pulled High -
Note[1]
Note [3]
L_DD[15]/
GPIO[73]
ICOCZ
LCD display data. (output) Transfers pixel information
from the LCD Controller to the external LCD panel.
Memory Controller grant. (output) Notifies an external
device it has been granted the system bus.
Pulled High -
Note[1]
Note [3]
L FCLK/
GPIO[74]
ICOCZ
LCD frame clock. (output) Indicates the start of a new
frame. Also referred to as Vsync.
Pulled High -
Note[1]
Note [3]
L LCLK/
GPIO[75]
ICOCZ
LCD line clock. (output) Indicates the start of a new line.
Also referred to as Hsync.
Pulled High -
Note[1]
Note [3]
L PCLK/
GPIO[76]
ICOCZ
LCD pixel clock. (output) Clocks valid pixel data into the
LCD’s line shift buffer.
Pulled High -
Note[1]
Note [3]
L BIAS/
GPIO[77]
ICOCZ
AC bias drive. (output) Notifies the panel to change the
polarity for some passive LCD panel. For TFT panels,
this signal indicates valid pixel data.
Pulled High -
Note[1]
Note [3]
Full Function UART Pins
FFRXD/
GPIO[34]
ICOCZ
Full Function UART Receive. (input)
MMC chip select 0. (output) Chip select 0 for the MMC
Controller.
Pulled High -
Note[1]
Note [3]
FFTXD/
GPIO[39]
ICOCZ
Full Function UART Transmit. (output)
MMC chip select 1. (output) Chip select 1 for the MMC
Controller.
Pulled High -
Note[1]
Note [3]
FFCTS/
GPIO[35]
ICOCZ Full Function UART Clear-to-Send. (input)
Pulled High -
Note[1]
Note [3]
FFDCD/
GPIO[36]
ICOCZ Full Function UART Data-Carrier-Detect. (input)
Pulled High -
Note[1]
Note [3]
FFDSR/
GPIO[37]
ICOCZ Full Function UART Data-Set-Ready. (input)
Pulled High -
Note[1]
Note [3]
FFRI/
GPIO[38]
ICOCZ Full Function UART Ring Indicator. (input)
Pulled High -
Note[1]
Note [3]
FFDTR/
GPIO[40]
ICOCZ Full Function UART Data-Terminal-Ready. (output)
Pulled High -
Note[1]
Note [3]
FFRTS/
GPIO[41]
ICOCZ Full Function UART Request-to-Send. (output)
Pulled High -
Note[1]
Note [3]
Bluetooth UART Pins
BTRXD/
GPIO[42]
ICOCZ Bluetooth UART Receive. (input)
Pulled High -
Note[1]
Note [3]
BTTXD/
GPIO[43]
ICOCZ Bluetooth UART Transmit. (output)
Pulled High -
Note[1]
Note [3]
Table 2-6. Pin & Signal Descriptions for the PXA255 Processor (Sheet 4 of 9)
Pin Name Type Signal Descriptions Reset State Sleep State