CC3220MOD_017 Datasheet, PDF (67/100 Pages) Texas Instruments – SimpleLink Wi-Fi CERTIFIED Wireless MCU Modules

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CC3220MOD, CC3220MODA
SWRS206B – MARCH 2017 – REVISED AUGUST 2017
6.9 Boot Modes
6.9.1 Boot Mode List
The CC3220MODx and CC3220MODAx module implements a sense-on-power (SoP) scheme to
determine the device operation mode.
SoP values are sensed from the module pin during power up. This encoding determines the boot flow.
Before the device is taken out of reset, the SoP values are copied to a register and used to determine the
device operation mode while powering up. These values determine the boot flow as well as the default
mapping for some of the pins (JTAG, SWD, UART0). Table 6-5 lists the pull configurations.
Table 6-5. CC3220MODx and CC3220MODAx Functional Configurations
NAME
UARTLOAD
FUNCTIONAL_2WJ
FUNCTIONAL_4WJ
UARTLOAD_FUNCTIONAL_4WJ
RET_FACTORY_IMAGE
SOP[2]
Pullup
Pulldown
Pulldown
Pulldown
Pulldown
SOP[1]
Pulldown
Pulldown
Pulldown
Pullup
Pullup
SOP[0]
Pulldown
Pullup
Pulldown
Pulldown
Pullup
SoP MODE
LDfrUART
Fn2WJ
Fn4WJ
LDfrUART_FnWJ
RetFactDef
COMMENT
Factory, lab Flash, and SRAM loads
through the UART. The device waits
indefinitely for the UART to load code.
The SOP bits then must be toggled to
configure the device in functional mode.
Also puts JTAG in 4-wire mode.
Functional development mode. In this
mode, 2-pin SWD is available to the
developer. TMS and TCK are available
for debugger connection.
Functional development mode. In this
mode, 4-pin JTAG is available to the
developer. TDI, TMS, TCK, and TDO are
available for debugger connection. The
default configuration for CC3220MODx
and CC3220MODAx modules.
Supports Flash and SRAM load through
UART and functional mode. The MCU
bootloader tries to detect a UART break
on UART receive line. If the break signal
is present, the device enters the
UARTLOAD mode, otherwise, the device
enters the functional mode. TDI, TMS,
TCK, and TDO are available for
debugger connection.
When module reset is toggled, the MCU
bootloader kickstarts the procedure to
restore factory default images.
All CC3220MODx and CC3220MODAx modules contain internal pull down resistors on the SOP[2:0] lines.
The application can use SOP2 for other functions after chip has powered up. However, to avoid spurious
SOP values from being sensed at power up, TI strongly recommends using the SOP2 pin only for output
signals. The SOP0 and SOP1 pins are multiplexed with the WLAN analog test pins and are not available
for other functions.
Copyright © 2017, Texas Instruments Incorporated
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