Wireless Cpu® Initiated Sleep; Figure 4. Wireless Cpu® Initiates Sleep, Host Initiates Time-Out Period A - Wavecom GR64 UART Sleep Protocols Application Note

2.4.3 Wireless CPU® Initiated Sleep
The example shows a similar situation to section 2.4.1, where the Wireless CPU® is
going through its initial power-up. After exchanging some data the Wireless CPU®
initiates sleep. The Host responds within the time-out period
Time Description
1 The Wireless CPU® is un-powered at this point, all UART1 signals are inactive.
2 The Wireless CPU® has completed its power-up cycle and all UART signals are active.
The UART interfaces are ready to communicate, as indicated by the respective states
of the hardware flow control lines.
3 The first serial data is sent from the Wireless CPU® to the Host.
4 The Host sends data to the Wireless CPU®, followed by a period of inactivity.
5 The Wireless CPU® requests sleep mode initiation by de-asserting DSR1 & CTS1.
6 Within the request timeout period
setting DSR1 and CTS1 signals high, thereby beginning the sleep period. The flow
control lines will remain inactive from this point onwards, until such time as a wake-
up event is triggered.
NOTE
APPLICATION NOTE
GR/GS64 UART Sleep Protocols
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Figure 4. Wireless CPU® initiates sleep, Host initiates time-out period
The time-out period
acknowledgement from the Host, the Wireless CPU® will wait for a
pre-defined period before making a further attempt to request
sleep mode initiation.
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a
, the Wireless CPU® acknowledges the request by
a
is 500ms max. If this period elapses with no
a.
a