XM33C321ASPZR datasheet(91/122 Pages) TI2

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8.17 Serial Wire Debug Interface

A serial wire debug (SWD) two-wire interface is provided via an Arm compatible serial wire debug port (SW-

DP) to enable access to multiple debug functions within the device. For a complete description of the debug

functionality, see the debug chapter of the MSPM33C3x 160-MHz Microcontrollers Technical Reference Manual.

Table 8-22. Serial Wire Debug Pin Requirements and Functions

DEVICE SIGNAL

DIRECTION

SWD FUNCTION

SWCLK

Input

Serial wire clock from debug probe

SWDIO

Input/Output

Bi-directional (shared) serial wire data

The MSPM33C321x devices also support boundary scan functionality through the TDO, TDI, SWCLK, and

SWDIO device signals. This conforms to the IEEE Std.1149.1-1990 boundary scan feature. To use this

functionality configure the device in 4 wire JTAG mode using the Table 8-23. For a complete description of

the boundary scan functionality, see the debug chapter of the MSPM33C3x 160-MHz Microcontrollers Technical

Reference Manual.

Table 8-23. Boundary Scan Pin Functionality

DEVICE SIGNAL

Boundary Scan Pin

Direction

Boundary Scan Functionality

TDO

Output

Test Data Out

TDI

Input

Test Data In

SWCLK

TCK

Input

Test Clock

SWDIO

TMS

Input

Test Mode Select

8.18 Bootstrap Loader (BSL)

The bootstrap loader (BSL) enables configuration of the device as well as programming of the device memory

through a UART or I2C serial interface. Access to the device memory and configuration through the BSL is

protected by a 256-bit user-defined HASH password, and it is possible to completely disable the BSL in the

device configuration, if desired. The BSL is enabled by default from TI to support use of the BSL for production

programming.

A minimum of two pins are required to use the BSL: the BSL_UART_RX and BSL_UART_TX signals (for UART),

or the BSL_I2C_SCL and BSL_I2C_SDA signals (for I2C) or the BSL_CAN_RX and BSL_CAN_TX signals (for

CAN). Additionally, one or two additional pins (BSL_INVOKE and NRST) may be used for controlled invocation

of the bootloader by an external host.

If enabled, the BSL may be invoked (started) in the following ways:

• The BSL is invoked during the boot process if the BSL_invoke pin state matches the defined BSL_invoke

logic level. If the device fast boot mode is enabled, this invocation check is skipped. An external host can

force the device into the BSL by asserting the invoke condition and applying a reset pulse to the NRST pin to

trigger a BOOTRST, after which the device will verify the invoke condition during the reboot process and start

the BSL if the invoke condition matches the expected logic level.

• The BSL may be invoked at runtime from application software by issuing a SYSRST with BSL entry

command.

Table 8-24. BSL Pin Requirements and Functions

DEVICE SIGNAL

CONNECTION

BSL FUNCTION

BSL_UART_RX

Required for UART

UART receive signal (RX), an input

BSL_UART_TX

Required for UART

UART transmit signal (TX) an output

BSL_I2C_SCL

Required for I2C

I2C BSL clock signal (SCL)

BSL_I2C_SDA

Required for I2C

I2C BSL data signal (SDA)

BSL_CAN_RX

Required for CAN

CAN receive signal (RX), an input

BSL_CAN_TX

Required for CAN

CAN receive signal (TX), an output

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MSPM33C321A, MSPM33C3219

SLASFB6A – DECEMBER 2025 – REVISED SEPTEMBER 2026

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