MSP430F5259 datasheet(20/107 Pages) TI1

20 / 107 page

MSP430F5259, MSP430F5258, MSP430F5257, MSP430F5256

MSP430F5255, MSP430F5254, MSP430F5253, MSP430F5252

SLAS903A – MAY 2013 – REVISED JULY 2013

www.ti.com

Bootstrap Loader - UART

The UART BSL enables users to program the flash memory or RAM using a UART serial interface. Access to the

device memory via the BSL is protected by an user-defined password. Because the F525x have split I/O power

domains, it is possible to interface with the BSL from either the DVCC or DVIO supply domains. This is useful

when the MSP430 is interfacing to a host on the DVIO supply domain. The BSL interface on the DVIO supply

domain (Table 8) uses the USCI_A0 module configured as a UART. The BSL interface on the DVCC supply

domain (Table 7) uses a timer-based UART.

For applications in which it is desirable to have BSL communication based on the DVCC supply domain, entry to

the BSL requires a specific sequence on the RSTDVCC/SBWTDIO and TEST/SBWTCK pins. Table 7 shows the

required pins and their function.

Table 7. DVCC BSL Pin Requirements and Functions

DEVICE SIGNAL

BSL FUNCTION

RSTDVCC/SBWTDIO

External reset

TEST/SBWTCK

Enable BSL

P6.1

Data transmit

P6.2

Data receive

DVCC, AVCC

Device power supply

DVIO

I/O power supply

DVSS

Ground supply

NOTE

Devices that are factory programmed with an UART BSL use the DVCC power supply

domain pin configuration per default (see Table 7).

NOTE

invoke

the

BSL

from

the

DVCC

domain,

the

RSTDVCC/SBWTDIO

and

TEST/SBWTCK pins must be used for the entry sequence. It is critical not to confuse the

RST/NMI pin with the RSTDVCC/SBWTDIO pin. In other MSP430 devices, SBWTDIO is

shared with the RST/NMI pin and RSTDVCC does not exist. Additional information can be

found in Designing with MSP430F522x and MSP430F521x Devices (SLAA558).

When using the DVIO supply domain for the BSL, entry to the BSL requires a specific sequence on the RST/NMI

and BSLEN pins. Table 8 shows the required pins and their functions. For further details on interfacing to

development tools and device programmers, see the MSP430™ Hardware Tools User's Guide (SLAU278). For a

complete description of the features of the BSL and its implementation, see the MSP430™ Programming Via the

Bootstrap Loader User's Guide (SLAU319). The BSL on the DVIO supply domain uses the USCI_A0 module

configured as a UART.

Table 8. DVIO BSL Pin Requirements and Functions

DEVICE SIGNAL

BSL FUNCTION

RST/NMI

External reset

BSLEN

Enable BSL

P3.3

Data transmit

P3.4

Data receive

DVCC, AVCC

Device power supply

DVIO

I/O power supply

DVSS

Ground supply

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