CC3235MODASF datasheet(74/100 Pages) TI1

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CC3235MODAS, CC3235MODASF

SWRS233 – OCTOBER 2019

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Product Folder Links: CC3235MODAS CC3235MODASF

Detailed Description

6.10 Restoring Factory Default Configuration

The module has an internal recovery mechanism that rolls back the file system to its predefined factory

image or restoring the factory default parameters of the device. The factory image is kept in a separate

sector on the sFLASH in a secure manner and cannot be accessed from the host processor. The following

restore modes are supported:

•

None—no factory restore settings

•

Enable restore of factory default parameters

•

Enable restore of factory image and factory default parameters

The restore process is performed by calling software APIs, or by pulling or forcing SOP[2:0] = 011 pins

and toggling the nRESET pin from low to high.

The process is fail-safe and resumes operation if a power failure occurs before the restore is finished. The

restore process typically takes about 8 seconds, depending on the attributes of the serial Flash vendor.

6.11 Boot Modes

6.11.1 Boot Mode List

The CC3235MODAx MCU 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.

All CC3235MODAx MCUs 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.

Table 6-5. CC3235MODAx 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 CC3235MODAx

MCUs.

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.

CC3235MODASF Datasheet(PDF) 74 Page - Texas Instruments

CC3235MODASF Datasheet(HTML) 74 Page - Texas Instruments

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