CC3120 Datasheet, PDF (29/57 Pages) Texas Instruments – SimpleLink Wi-Fi Wireless Network Processor Internet-of-Things Solution for MCU Applications

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CC3120
SWAS034 – FEBRUARY 2017
4.15.3 3-Wire UART Topology
The 3-wire UART topology requires only the following lines (see Figure 4-19):
• RX
• TX
• CTS
X ^nRTS
nCTS
HOST MCU
UART
TX
RX
H_IRQ
nRTS
nCTS
TX
CC3120R SL
UART
RX
X
H_IRQ
Copyright © 2017, Texas Instruments Incorporated
Figure 4-19. 3-Wire UART Topology
Using this topology requires meeting one of the following conditions:
• The host always stays awake or active.
• The host goes to sleep but the UART module has receiver start-edge detection for auto-wake-up and
does not lose data.
• The host can always receive any amount of data transmitted by the SimpleLink device because there
is no flow control in this direction.
Because there is no full flow control, the host cannot stop the SimpleLink device to send its data; thus, the
following parameters must be carefully considered:
• Maximum baud rate
• RX character interrupt latency and low-level driver jitter buffer
• Time consumed by the user's application
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