CC3100MOD_15 Datasheet, PDF (21/41 Pages) Texas Instruments – CC3100MOD SimpleLink™ Certified Wi-Fi® Network Processor Internet-of-Things Module Solution for MCU Applications

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CC3100MOD
SWRS161 – DECEMBER 2014
RTS
RTS
HOST MCU
UART
CTS
TX
RX
CTS
TX
RX
CC3100 SL
UART
H_IRQ
X
H_IRQ
Figure 4-12. 4-Wire UART Configuration
SWAS031-089
4.11.4.3.3 3-Wire UART Topology
The 3-wire UART topology requires only the following lines (see Figure 4-13):
• RX
• TX
• CTS
RTS _X
RTS
CTS
CTS
HOST MCU
UART
TX
RX
TX
CC3100 SL
UART
RX
H_IRQ
X
H_IRQ
SWAS031-090
Figure 4-13. 3-Wire UART Topology
Using this 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 wakeup 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:
• Max 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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