4D SYSTEMS

PICASO Processor

© 2012 4D SYSTEMS

Page 5 of 23

www.4dsystems.com.au

4. Pin Configuration and Summary

PICASO Processor Pin Out

Pin

Symbol I/O Description

1

IO1

I/O

General Purpose IO1 pin. This pin is 5.0V tolerant.

2

XR

A

4-Wire Resistive Touch Screen Right signal. Connect this pin to XR or X+

signal of the touch panel.

3

YU

A

4-Wire Resistive Touch Screen Up signal. Connect this pin to YU or Y+ signal

of the touch panel.

4

SCK

O

SPI Serial Clock output. SD memory card use only. Connect this pin to the SPI

Serial Clock (SCK) signal of the memory card.

5

SDI

I

SPI Serial Data Input. SD memory card use only. Connect this pin to the SPI

Serial Data Out (SDO) signal of the memory card.

6

SDO

O

SPI Serial Data Output. SD memory card use only. Connect this pin to the SPI

Serial Data In (SDI) signal of the memory card.

7

RESET

I

Master Reset signal. Connect a 4.7K resistor from this pin to VCC.

8

SDCS

O

SD Memory-Card Chip Select. SD memory card use only. Connect this pin to

the Chip Enable (CS) signal of the memory card.

9, 20, 25, 41

GND

P

Device Ground.

10, 19, 26,

38, 57

VCC

P

Device Positive Supply.

I = Input, O = Output, P = Power, A = Analogue