CC3120MOD Datasheet, PDF (23/52 Pages) Texas Instruments – SimpleLink Wi-Fi CERTIFIED Network Processor Internet-of-Things Module Solution for MCU Applications

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CC3120MOD
SWRS205 – MARCH 2017
5.14.2 Host UART Interface
The SimpleLink device requires the UART configuration described in Table 5-7.
Table 5-7. SimpleLink™ UART Configuration
PROPERTY
SUPPORTED CC3120 CONFIGURATION
Baud rate
115200 bps, no auto-baud rate detection, can be changed by the host up to 3 Mbps using a special command
Data bits
8 bits
Flow control
CTS/RTS
Parity
None
Stop bits
1
Bit order
Least significant bit (LSB) first
Host interrupt polarity Active high
Host interrupt mode
Endianness
Rising edge or level 1
Little-endian only⁽¹⁾
(1) The SimpleLink device does not support automatic detection of the host length while using the UART interface.
5.14.2.1 5-Wire UART Topology
Figure 5-11 shows the typical 5-wire UART topology comprised of four standard UART lines plus one IRQ
line from the device to the host controller to allow efficient low power mode.
nRTS
HOST MCU
UART
nCTS
TX
RX
HOST_INTR(IRQ)
nRTS
nCTS
TX
CC3120MOD SL
UART
RX
HOST_INTR(IRQ)
Figure 5-11. Typical 5-Wire UART Topology
Figure 5-11 shows the typical and recommended UART topology because it offers the maximum
communication reliability and flexibility between the host and the SimpleLink device.
5.14.2.2 4-Wire UART Topology
The 4-wire UART topology eliminates the host IRQ line (see Figure 5-12). Using this topology requires
one of the following conditions to be met:
• Host is always awake or active.
• Host goes to sleep, but the UART module has receiver start-edge detection for automatic wake up and
does not lose data.
nRTS
nRTS
HOST MCU
UART
nCTS
TX
RX
nCTS
TX
CC3120MOD SL
UART
RX
H_IRQ
X
H_IRQ
Figure 5-12. 4-Wire UART Configuration
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Specifications
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