Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 83)

100

101

SMART I/O User’s Manual

Chapter 3 SMART-EXT

3.3 Functional Description

Figure 3.3.1: SMART-EXT Block Diagram

The SMART-EXT is a carrier board for up to 2 SMART-Modules with data

transfer between SMART-BASE and EXT units being performed by the

interface connector incorporating the Motorola synchronous Serial Peripheral

Interface (SPI).

The maximum bit transfer rate is set to 1 MHz which ensures a typical

response time from an addressed extension slot of approximately 50µs.

The MCU (Micro Controller Unit - 68HC05C4) handles the SPI transfers

and the slot-dependent commands and actions through the SMART-EXT

firmware burned into the MCU mask or in an OTP (One-Time Programma-

ble) PROM area.

In order to communicate with a particular SMART-EXT slot, a specific PEP

defined protocol has to be observed. All necessary functions are provided in

the OS-9 ‘C’ library SMAC.L which should be included when writing a

specific C’ application program.

Slot Detect

Logic and

Buffer

Slot

Interface

Connector

with

Integrated

SPI

Interface

Connector

with

Integrated

SPI

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