CC3220MODAX datasheet(67/100 Pages) TI1

67 / 100 page

CC3220MOD, CC3220MODA

www.ti.com

SWRS206B – MARCH 2017 – REVISED AUGUST 2017

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Product Folder Links: CC3220MOD CC3220MODA

Detailed Description

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

SOP[2]

SOP[1]

SOP[0]

SoP MODE

COMMENT

UARTLOAD

Pullup

Pulldown

LDfrUART

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_2WJ

Pulldown

Pullup

Fn2WJ

Functional development mode. In this

mode, 2-pin SWD is available to the

developer. TMS and TCK are available

for debugger connection.

FUNCTIONAL_4WJ

Pulldown

Fn4WJ

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.

UARTLOAD_FUNCTIONAL_4WJ

Pulldown

Pullup

Pulldown

LDfrUART_FnWJ

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.

RET_FACTORY_IMAGE

Pulldown

Pullup

RetFactDef

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.

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