CC3120MOD Datasheet, PDF (24/52 Pages) Texas Instruments – SimpleLink Wi-Fi CERTIFIED Network Processor Internet-of-Things Module Solution for MCU Applications

CC3120MOD
SWRS205 – MARCH 2017
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5.14.2.3 3-Wire UART Topology
The 3-wire UART topology requires only the following lines (see Figure 5-13).
• RX
• TX
• nCTS
X ^nRTS
nCTS
HOST MCU
UART
TX
RX
H_IRQ
X
nRTS
nCTS
TX
CC3120MOD SL
UART
RX
H_IRQ
Figure 5-13. 3-Wire UART Topology
Using 3-wire topology requires one of the following conditions to be met:
• Host always stays awake or active.
• Host goes to sleep, but the UART module has receiver start-edge detection for auto wake up and does
not lose data.
• 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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Specifications
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