TIMER A Cont..

1 second timer in up mode

using internal DCO (0.999908182 seconds)

Here calculations are done assuming DCO = 1.1MHz

Time  = ((1100+1)/1.1MHz)*999 = 0.999908182  seconds…!

.include "msp430g2x31.inc"
org 0xf800
    mov #(WDTPW|WDTHOLD), &WDTCTL
    mov #0x280, SP
    mov.b #0x41,&P1DIR
    clr.b P1OUT
    clr R5
    mov #(TASSEL_2|MC_1|ID_0|TAIE), &TACTL
    mov #1100, &TACCR0
    eint
jimmy:  jmp jimmy
TAISR:
    inc R5
    cmp #999, R5
    jne exit
    xor.b #0x41,&P1OUT
    clr R5
exit:
    bic #1, &TACTL
    reti
org     0FFF0h
dw      TAISR
org     0FFFEh
dw 0xf800

Timer A — high speed blinking using up/down mode

Time  = (65000*2)+1/1.1MHz = 0.118182727

.include "msp430g2x31.inc"
org 0xf800
    mov #(WDTPW|WDTHOLD), &WDTCTL
    mov #0x280, SP
    mov.b #0x41,&P1DIR
    mov.b #0x41,P1OUT
    mov #(TASSEL_2|MC_3|TAIE), &TACTL
    mov #65000, &TACCR0
    eint
jimmyloop:
    jmp jimmyloop
jimmyisr:
    bic #1,&TACTL
    xor.b #41h, &P1OUT
    reti
ORG     0FFF0h
DW      jimmyisr
ORG     0FFFEh
DW      0xf800

Timer A — high speed blinking using up mode & CCIFG

.include "msp430g2x31.inc"
org f800h
    mov #(WDTPW|WDTHOLD), &WDTCTL
    mov #0x280, SP
    mov.b #0x41,&P1DIR
    mov.b #0x41,P1OUT
    mov #(TASSEL_2|MC_1), &TACTL
    mov #CCIE, &TACCTL0
    mov #65000, &TACCR0
    eint
jimmyloop:
    jmp jimmyloop
jimmyisr:
    xor.b #41h, &P1OUT
    reti
ORG     0FFF2h
DW      jimmyisr
ORG     0FFFEh
DW      0xf800

Timer A — high speed blinking using up/down mode & CCIFG

.include "msp430g2x31.inc"
org 0xf800
    mov #(WDTPW|WDTHOLD), &WDTCTL
    mov #0x280, SP
    mov.b #0x41,&P1DIR
    mov.b #0x41,P1OUT
    mov #(TASSEL_2|MC_3), &TACTL
    mov #CCIE, &TACCTL0
    mov #65000, &TACCR0
    eint
jimmyloop:
    jmp jimmyloop
jimmyisr:
    xor.b #41h, &P1OUT
    reti
ORG     0FFF2h
DW      jimmyisr
ORG     0FFFEh
DW      0xf800