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Picaso Processor Datasheet
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2017 4D Labs Semiconductors Page 7 of 27
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Picaso Processor Pin Out (continued…)
PIN SYMBOL I/O DESCRIPTION
11 D5 I/O Display Data Bus bit 5.
12 D4 I/O Display Data Bus bit 4.
13 D3 I/O Display Data Bus bit 3.
14 D2 I/O Display Data Bus bit 2.
15 D1 I/O Display Data Bus bit1.
16 D0 I/O Display Data Bus bit 0.
17 D6 I/O Display Data Bus bit 6.
18 D7 I/O Display Data Bus bit 7.
21 D8 I/O Display Data Bus bit 8.
22 D9 I/O Display Data Bus bit 9.
23 D10 I/O Display Data Bus bit 10.
24 D11 I/O Display Data Bus bit 11.
27 D12 I/O Display Data Bus bit 12.
28 D13 I/O Display Data Bus bit 13.
29 D14 I/O Display Data Bus bit 14.
30 D15 I/O Display Data Bus bit 15.
31 RX1 I
Asynchronous Serial port COM1 receive pin, RX1. Connect this pin to
external serial device Transmit (Tx) signal. This pin is 5.0V tolerant.
32 TX1 O
Asynchronous Serial port COM1 transmit pin, TX1. Connect this pin to
external serial device receive (Rx) signal. This pin is 5.0V tolerant.
33 TX0 O
Asynchronous Serial port Transmit pin, TX. Connect this pin to host micro-
controller Serial Receive (Rx) signal. The host receives data from Picaso
via this pin. This pin is 5.0V tolerant.
34 RX0 I
Asynchronous Serial port Receive pin, RX. Connect this pin to host micro-
controller Serial Transmit (Tx) signal. The host transmits data to Picaso via
this pin. This pin is 5.0V tolerant.
35 RES O
Display RESET. Picaso initialises the display by strobing this pin LOW.
Connect this pin to the Reset (RES) signal of the display.
36 SDA I/O I2C Data In/Out.
37 SCL O I2C Clock Output.
39 CLK1 I Device Clock input 1 of a 12MHz crystal.
40 CLK2 O Device Clock input 2 of a 12MHz crystal.
42 BUS6 I/O General Purpose Parallel I/O BUS(0..7), bit 6. This pin is 5.0V tolerant.
43 BUS7 I/O General Purpose Parallel I/O BUS(0..7), bit 7. This pin is 5.0V tolerant.
44
IO5/BUS_
WR
I/O
General Purpose IO5 pin. Also used for BUS_WR signal to write and latch
the data to the parallel GPIO BUS(0..7).
45 AUDENB O
Audio Enable. Connect this pin to amplifier control.
LOW: Enable external Audio amplifier.
HIGH: Disable external Audio amplifier.
46 AUDIO O
Pulse Width Modulated (PWM) Audio output. Connect this pin to a 2
stage low pass filter then into an audio amplifier.
47 XL O
4-Wire Resistive Touch Screen Left signal. Connect this pin to XL or X-
signal of the touch panel.
48 YD O
4-Wire resistive touch screen bottom signal. Connect this pin to YD or Y-
signal of the touch panel.
49 DCENB O
DC-DC high voltage enable signal. This maybe the high voltage that drives
the LCD backlight or the OLED panel supply.
High: Enable DC-DC converter.
Low : Disable DC-DC converter.
50 BUS0 I/O General Purpose Parallel I/O BUS(0..7), bit 0. This pin is 5.0V tolerant.
I = Input, O = Output, P = Power, A = Analogue