UR8HC007-0A4-FQ Просмотр технического описания (PDF) - Semtech Corporation

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UR8HC007-0A4-FQ

Zero-Power™ Input Device and Power Management IC

Semtech Corporation 

JUNOTM FAMILY COMMUNICATIONS INTERFACE

The Juno™ family of controllers

implements two modes of serial

communications: The "Synchronous

Peripheral Interface" (SPI) mode

and the "Asynchronous Serial

Mode" (UART).

The diagrams below describe the SPI and asynchronous communications

interfaces, respectively.

SPI Communications Interface

The SPI is a synchronous bi-

directional, multi-slave interface that

supports bit rates up to 500 Kb/s.

Several Hosts and companion chips

implement the SPI protocol in order

to communicate with a wide range

of peripherals such as EEPROMs,

A/D converters, MCUs and other

system components. Alternatively,

the SPI may be implemented

through software on the Host side.

The Juno™ family implements the

_ATN as an additional hand-shake

signal in order to support low power

operation of the bus.

Host

(master)

MOSI

MISO

SCLK

_SS

_ATN

_SS

USAR Juno™

(slave)

SLAVE 2

Asynchronous Communications Interface

Asynchronous Serial Mode is a

UART-type interface that operates

at a fixed baud rate of 62.5 Kb/s.

Both interfaces are implemented

through the same set of four pins.

Host

CTS

UR8HC007

CTS

The IC determines the mode of

communication with the Host during

power-up by reading the value of

the SCLK/ISEL pin. If the pin is tied

low, asynchronous mode is

enabled. If it is high, the SPI

interface is enabled.

Please refer to the JunoTM A4

Technical Reference Manual for a

description of handshake and

critical timing parameters for each

interface.

RTS

RTS

RxD

RxD

TxD

TxD

ISEL

GND

Copyright ©1998-2001 Semtech Corporation

7

DOC8-007-0A4 -DS-104

www.semtech.com

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