Datasheet

MSP430F21x1

SLAS439F –SEPTEMBER 2004– REVISED AUGUST 2011

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Memory Organization

Table 10. Memory Organization

MSP430F2101 MSP430F2111 MSP430F2121 MSP430F2131

Memory Size 1 KB Flash 2 KB Flash 4 KB Flash 8 KB Flash

Main: interrupt vector Flash 0xFFFF to 0xFFE0 0xFFFF to 0xFFE0 0xFFFF to 0xFFE0 0xFFFF to 0xFFE0

Main: code memory Flash 0xFFFF to 0xFC00 0xFFFF to 0xF800 0xFFFF to 0xF000 0xFFFF to 0xE000

Information memory Size 256 Byte 256 Byte 256 Byte 256 Byte

Flash 0x10FF to 0x1000 0x10FF to 0x1000 0x10FF to 0x1000 0x10FF to 0x1000

Boot memory Size 1 KB 1 KB 1 KB 1 KB

ROM 0x0FFF to 0x0C00 0x0FFF to 0x0C00 0x0FFF to 0x0C00 0x0FFF to 0x0C00

RAM Size 128 B 128 B 256 Byte 256 Byte

0x027F to 0x0200 0x027F to 0x0200 0x02FF to 0x0200 0x02FF to 0x0200

Peripherals 16-bit 0x01FF to 0x0100 0x01FF to 0x0100 0x01FF to 0x0100 0x01FF to 0x0100

8-bit 0x0FF to 0x010 0x0FF to 0x010 0x0FF to 0x010 0x0FF to 0x010

8-bit SFR 0x0F to 0x00 0x0F to 0x00 0x0F to 0x00 0x0F to 0x00

Bootstrap Loader (BSL)

The MSP430 bootstrap loader (BSL) enables users to program the flash memory or RAM using a UART serial

interface. Access to theMSP430memoryvia theBSLis protected by user-defined password.Abootstrap loader

security key is provided at address 0FFDEh to disable the BSL completely or to disable the erasure of the flash if

an invalid password is supplied. For complete description of the features of the BSL and its implementation, see

the MSP430 Programming Via the Bootstrap Loader User’s Guide, literature number SLAU319.

Table 11. BSL Keys

BSLKEY DESCRIPTION

00000h Erasure of flash disabled if an invalid password is supplied

0AA55h BSL disabled

any other value BSL enabled

Table 12. BSL Function Pins

BSL FUNCTION DW, PW, DGV PACKAGE PINS RGE PACKAGE PINS

Data transmit 14 - P1.1 14 - P1.1

Data receive 10 - P2.2 8 - P2.2

Flash Memory

The flash memory can be programmed via the JTAG port, the bootstrap loader, or in-system by the CPU. The

CPU can perform single-byte and single-word writes to the flash memory. Features of the flash memory include:

• Flash memory has n segments of main memory and four segments of information memory (A to D) of

64 bytes each. Each segment in main memory is 512 bytes in size.

• Segments 0 to n may be erased in one step, or each segment may be individually erased.

• Segments A to D can be erased individually, or as a group with segments 0 to n.

Segments A to D are also called information memory.

• Segment A contains calibration data. After reset, segment A is protected against programming and erasing. It

can be unlocked, but care should be taken not to erase this segment if the device-specific calibration data is

required.