2.4.4
Wireless CPU® Initiated Wake-up
In this example the UART interfaces are in sleep mode and the Wireless CPU® initiates
a wake-up
.
Figure 5.
UARTs in sleep mode, Wireless CPU® initiates wake-up
Time Description
1
The UART interface is inactive, the Wireless CPU® and Host may be in a sleep (low
power) state at this point in time.
2
The Wireless CPU® initiates a wake-up request by asserting DSR1. Generally CTS1
will also become active at the same instant.
3
The Wireless CPU® acknowledges the wake-up request by asserting DTR1 & RTS1.
At this point both UART interface are ready to accept data transfers, as indicated by
the active states of their respective hardware flow-control lines.
4
Data is sent by the Wireless CPU®.
5
Data is sent by the Host. Normal data flow can continue until such time as the flow-
control lines change their states, either to interrupt data flow temporarily or to
initiate another sleep request.
APPLICATION NOTE
GR/GS64 UART Sleep Protocols
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