Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller VQFN 24 (4x4) 16-Bit 16 MHz I/O number 16

MSP430F21x1

SLAS439F –SEPTEMBER 2004– REVISED AUGUST 2011

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Interrupt Vector Addresses

The interrupt vectors and the power-up starting address are located in the address range of 0xFFFF to 0xFFC0.

The vector contains the 16-bit address of the appropriate interrupt handler instruction sequence.

If the reset vector (located at address 0xFFFE) contains 0xFFFF (for example, if flash is not programmed), the

CPU goes into LPM4 immediately after power up.

Table 5. Interrupt Vector Addresses

INTERRUPT SOURCE INTERRUPT FLAG SYSTEM INTERRUPT WORD ADDRESS PRIORITY

Power-up PORIFG

External reset RSTIFG

Watchdog WDTIFG Reset 0xFFFE 31, highest

Flash key violation KEYV

(1)

PC out of range

(2)

NMI NMIIFG (non)-maskable

Oscillator fault OFIFG (non)-maskable 0xFFFC 30

Flash memory access violation ACCVIFG

(1)(3)

(non)-maskable

0xFFFA 29

0xFFF8 28

Comparator_A+ CAIFG maskable 0xFFF6 27

Watchdog Timer+ WDTIFG maskable 0xFFF4 26

Timer_A3 TACCR0 CCIFG

(4)

maskable 0xFFF2 25

TACCR2, TACCR1 CCIFG,

Timer_A3 maskable 0xFFF0 24

TAIFG

(1)(4)

0xFFEE 23

0xFFEC 22

0xFFEA 21

0xFFE8 20

I/O port P2 (eight flags) P2IFG.0 to P2IFG.7

(1)(4)

maskable 0xFFE6 19

I/O port P1 (eight flags) P1IFG.0 to P1IFG.7

(1)(4)

maskable 0xFFE4 18

0xFFE2 17

0xFFE0 16

See

(5)

0xFFDE 15

See

(6)

0xFFDC to 0xFFC0 14 to 0, lowest

(1) Multiple source flags

(2) A reset is generated if the CPU tries to fetch instructions from within the module register memory address range (0x0000 to 0x01FF) or

from within unused address range.

(3) (non)-maskable: the individual interrupt-enable bit can disable an interrupt event, but the general interrupt enable cannot.

(4) Interrupt flags are located in the module.

(5) This location is used as bootstrap loader security key (BSLSKEY).

A value of 0xAA55 at this location disables the BSL completely.

A value of 0x0 disables the erasure of the flash if an invalid password is supplied.

(6) The interrupt vectors at addresses 0xFFDC to 0xFFC0 are not used in this device and can be used for regular program code if

necessary.