Wavecom GR64, Примечание к применению, Страница: 7 / 26

2 Standby Handshaking
Standby Handshaking can be used when all UART signal lines are connected between
the Host and Wireless CPU®. This method cannot be used by embedded applications.
When enabled, the Host and Wireless CPU® use modem control lines in addition to
receive and transmit to coordinate wake and sleep.
2.1 UART 1 Signal Description
Function: Primary UART
Description: Asynchronous transmit and receive port for data communication
between Wireless CPU® and Host
Signal Name Connectivity Direction If not used
DTM1 [Host
⇒
Wireless CPU®] required
DFM1 [Wireless CPU® ⇒ Host] required
RTS1 [Host
⇒
Wireless CPU®] required
CTS1 [Wireless CPU®
⇒
Host] required
DTR1 [Host ⇒ Wireless CPU®] required (for Standby Handshaking)
DSR1 [Wireless CPU® ⇒ Host] required (for Standby Handshaking)
DCD1 [Wireless CPU®
⇒
Host] leave open circuit
RI
[Wireless CPU®
⇒
Host]
leave open circuit
2.1.1 Description
UART 1 is the primary communications port between the Host application and the
Wireless CPU®. The UART is compliant with NS 16C750, and may be used in
conjunction with the additional flow control signals.
The UART1 interface supports baud rates up to 115.2kbaud (for standard PC) to a
maximum 460.8kbaud. It supports autobauding for AT commands.
The UART 1 interface available on the GR/GS64 products has been extended using a
proprietary method to allow a special mechanism for enabling sleep (low power mode)
initiated by either the Host application of the Wireless CPU®, primarily to conserve
power when communication between the products is not necessary.
The GS/GR64 product possesses a second UART, which implements a subset of the
above signals. However, all references to UART signals in this document are related
to UART 1 only since this is the only UART through which the sleep protocol can be
APPLICATION NOTE
GR/GS64 UART Sleep Protocols
Page: 7/26
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable