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MSP430F449IPZ Datasheet(PDF) 22 Page - Texas Instruments

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Part # MSP430F449IPZ
Description  MIXED SIGNAL MICROCONTROLLER
PDF  85 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

MSP430F449IPZ Datasheet(HTML) 22 Page - Texas Instruments

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MSP430x43x, MSP430x44x
MIXED SIGNAL MICROCONTROLLER
SLAS344A – JANUARY 2002 – REVISED FEBRUARY 2002
22
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
flash memory, interrupt and security key violation
System Reset Generator
Vcc
IE1.4
NMI
TMSEL
OSCFault
RST/NMI
____
NMIRS
PUC
IFG1.1
POR
OFIFG
S
PUC
IRQA: Interrupt request accepted
Clear
NMIIE
NMIIFG
S
PUC
Clear
IFG1.4
Watchdog Timer Module
WDTQn
IE1.0
PUC
Clear
WDTIE
IFG1.0
POR
WDT_IRQA
Clear
WDTIFG
IRQ
TMSEL
S
Counter
EQU
PUC
POR
NMIES
IE1.5
ACCV
FCTL1.1
ACCVIFG
S
PUC
Clear
ACCVIE
Flash Module
KEYV
Flash Module
Flash Module
POR
IE1.1
PUC
NMI_IRQA
Clear
OFIE
PUC
Figure 1. Block Diagram of NMI Interrupt Sources
One NMI vector is used for three NMI events: RST/NMI (NMIIFG), oscillator fault (OFIFG), and flash memory
access violation (ACCVIFG). The software can determine the source of the interrupt request since all flags
remain set until they are reset by the software. The enable flag(s) must be set only within one instruction directly
before the return-from-interrupt (RETI) instruction. This ensures that the stack remains under control. A pending
NMI interrupt request does not increase stack demand unnecessarily.



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