PICASO datasheet(9/24 Pages) ETC2

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4D SYSTEMS

PICASO Processor

Page 9 of 23

www.4dsystems.com.au

Item

Sym Min Typ Max Unit

Read Low Pulse

tRL

150

Read High Pulse

tRH 150

Read Bus Cycle Total

tRT

300

Read Data Hold

tDH

SPI Interface – Memory Card

5.2.

The PICASO supports SD, micro-SD and MMC

memory cards via its hardware SPI interface. The

memory card is used for all multimedia file

retrieval such as images, animations and movie

clips and the SPI interface is dedicated for this

purpose only. The memory card can also be used

as general purpose storage for data logging

applications (RAW and FAT16 format support).

Support is available for micro-SD with up to 2GB

capacity and for high capacity HC memory cards

starting from 4GB and above.

SDI pin (SPI Serial Data In):

The SPI Serial Data Input (SDI). SD memory card

use only. Connect this pin to the SPI Serial Data

Out (SDO) signal of the memory card.

SDO pin (SPI Serial Data Out):

The SPI Serial Data Output (SDI). SD memory card

use only. Connect this pin to the SPI Serial Data In

(SDI) signal of the memory card.

SCK pin (SPI Serial Clock):

The SPI Serial Clock output (SCK). SD memory card

use only. Connect this pin to the SPI Serial Clock

(SCK) signal of the memory card.

SDCS pin (SD Memory Card Chip Select):

SD Memory-Card Chip Select (SDCS). SD memory

card use only. Connect this pin to the Chip Enable

(CS) signal of the memory card.

Serial Ports - COM0, COM1 UARTS

5.3.

The PICASO Processor has two dedicated

hardware Asynchronous Serial ports that can

communicate with external serial devices. These

are referred to as the COM0 and the COM1 serial

ports.

The primary features are:

•

Full-Duplex 8 bit data transmission and

reception.

•

Data format: 8 bits, No Parity, 1 Stop bit.

•

Independent Baud rates from 300 baud

up to 256K baud.

•

Single byte transmits and receives or a

fully buffered service. The buffered

service feature runs in the background

capturing and buffering serial data

without the user application having to

constantly poll any of the serial ports. This

frees up the application to service other

tasks.

A single byte serial transmission consists of the

start bit, 8-bits of data followed by the stop bit.

The start bit is always 0, while a stop bit is always

1. The LSB (Least Significant Bit, Bit 0) is sent out

first following the start bit. Figure below shows a

single byte transmission timing diagram.

COM0 is also the primary interface for 4DGL user

program downloads and chip configuration PmmC

programming.

Once

the

compiled

4DGL

application

program

(EVE

byte-code)

downloaded and the user code starts executing,

the serial port is then available to the user

application. Refer to Section 7. In-Circuit-Serial-

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