
LCD module signals
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Example: Implementing gpio[16] and gpio[17]
LCD module signals
The LCD module signals are multiplexed with GPIO pins. They include seven control signals and up
to 24 data signals. Table 13 describes the control signals. Table 14 and Table 15 provide details for
the data signals.
Signal name Type Description
CLPOWER Output LCD panel power enable
CLLP Output Line synchronization pulse (STN) / horizontal synchronization
pulse (TFT)
CLCP Output LCD panel clock
CLFP Output Frame pulse (STN) / vertical synchronization pulse (TFT)
CLAC Output STN AC bias drive or TFT data enable output
CLD[23:0] Output LCD panel data (see Table 14 and Table 15)
CLLE Output Line end signal
Table 13: LCD module signal descriptions
O
USB Power
Controller
2.4K
NS97xx
INV
GPIO[xy]
Rpul l-up
RC fi lter = 500uS
Cfilter
Rfilter
NAND2
ENABLE_n
OVERCUR_n
3.3V
This circuit is required to prevent USB
power being enabled before code has s et
GPIO[17] to mode 00. Pulling down
GPIO[17] effects CPU speed.
USB_ PWR,
GPIO[17],
BOOTST_ND4
USB_ OVR
GPIO[16]
O
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