;******************************************************************************
;   MSP430x24x Demo - Software Port Interrupt on P1.4 from LPM4
;
;   Description: A hi/low transition on P1.4 will trigger P1_ISR which,
;   toggles P1.0. Normal mode is LPM4 ~ 0.1uA. LPM4 current can be measured
;   with the LED removed, all unused P1.x/P2.x configured as output or inputs
;   pulled high or low, and ensure the P2.0 interrupt input does not float.
;   ACLK = 32.768kHz, MCLK = SMCLK = default DCO
;
;                MSP430x249
;             -----------------
;         /|\|                 |
;          | |                 |
;          --|RST              |
;      /|\   |                 |
;       --o--|P1.4         P1.0|-->LED
;      \|/
;
;   B. Nisarga
;   Texas Instruments Inc.
;   September 2007
;   Built with IAR Embedded Workbench Version: 3.42A
;******************************************************************************
#include  <msp430x24x.h>
;-------------------------------------------------------------------------------
            RSEG    CSTACK                  ; Define stack segment
;-------------------------------------------------------------------------------
            RSEG    CODE                    ; Assemble to Flash memory
;-----------------------------------------------------------------------------
RESET       mov.w   #SFE(CSTACK),SP         ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupP1     bis.b   #BIT0,&P1DIR            ; P1.0 output
            bis.b   #010h,&P1IE             ; P1.4 Interrupt enabled
            bis.b   #010h,&P1IES            ; P1.4 hi/low edge
            bic.b   #010h,&P1IFG            ; P1.4 IFG Cleared
                                            ;
Mainloop    bis.w   #LPM4+GIE,SR            ; LPM4, enable interrupts
            nop                             ; Required only for debugger
                                            ;
;-----------------------------------------------------------------------------
P1_ISR     ; Toggle P1.0 Output
;-----------------------------------------------------------------------------
            xor.b   #BIT0,&P1OUT            ; P1.0 = toggle
            bic.b   #010h,&P1IFG            ; P1.4 IFG Cleared
            reti                            ; Return from ISR
                                            ;
;-----------------------------------------------------------------------------
            COMMON  INTVEC                  ; Interrupt Vectors
;-----------------------------------------------------------------------------
            ORG     RESET_VECTOR            ; MSP430 RESET Vector
            DW      RESET                   ;
            ORG     PORT1_VECTOR            ; P1.x Vector
            DW      P1_ISR                  ;
            END