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IN NO EVENT WILL TI'S ; AGGREGATE LIABILITY UNDER THIS AGREEMENT OR ARISING OUT OF ; YOUR USE OF THE PROGRAM EXCEED FIVE HUNDRED DOLLARS ; (U.S.$500). ; ; Unless otherwise stated, the Program written and copyrighted ; by Texas Instruments is distributed as "freeware". You may, ; only under TI's copyright in the Program, use and modify the ; Program without any charge or restriction. You may ; distribute to third parties, provided that you transfer a ; copy of this license to the third party and the third party ; agrees to these terms by its first use of the Program. You ; must reproduce the copyright notice and any other legend of ; ownership on each copy or partial copy, of the Program. ; ; You acknowledge and agree that the Program contains ; copyrighted material, trade secrets and other TI proprietary ; information and is protected by copyright laws, ; international copyright treaties, and trade secret laws, as ; well as other intellectual property laws. To protect TI's ; rights in the Program, you agree not to decompile, reverse ; engineer, disassemble or otherwise translate any object code ; versions of the Program to a human-readable form. You agree ; that in no event will you alter, remove or destroy any ; copyright notice included in the Program. TI reserves all ; rights not specifically granted under this license. Except ; as specifically provided herein, nothing in this agreement ; shall be construed as conferring by implication, estoppel, ; or otherwise, upon you, any license or other right under any ; TI patents, copyrights or trade secrets. ; ; You may not use the Program in non-TI devices. ;******************************************************************************* ; ; RTC USING THE WATCHDOG TIMER ; ; Description: This program demonstrates a real time clock with hours ; minutes and seconds. The Mainloop immediately puts the MSP430 into LPM3. ; The Watchdog timer Interrupts at exactly 1-second intervals and returns the ; MSP430 to active mode which allows the program to complete ; the Mainloop. Mainloop calls a Clock routine then returns to LPM3. ; ; This program is written specifically for the MSP430F1121, but could ; easily be adapted for any other MSP430 device. ; ; Three registers are used to store the seconds, minutes ; and hour values. ; ; ;******************************************************************************* ; #include "msp430x11x1.h" ; include std defs ; RTC variables #define SEC R13 #define MIN R14 #define HR R15 ;----------------------------------------------------------------------------- ; Program RESET RSEG CODE ;----------------------------------------------------------------------------- RESET MOV #02FEh,SP ; Initialize stackpointer CALL #Setup ; Prepare LCD and basic timmer ; Mainloop Mainloop BIS #LPM3,SR ; Set SR bits for LPM3 CALL #Clock ; Update Clock JMP Mainloop ; Endless Loop ;----------------------------------------------------------------------------- ; Clock: Update clock SEC and MIN and HR ; ; Originally written by Lutz Bierl. ; ; This is the routine that counts the hours, minutes and seconds. ; It can be used with any counter peripheral on any MSP430 device, ; as long as it is executed once per second. ; ; This particular routine is very basic. It only counts minutes, seconds ; and hours as BCD numbers. Hex values could also be used if desired. ; ; Refer to the MSP430 Application Report Book for more extensive clock ; routines that include counters for years, adjustments for leap years, etc. ; ;----------------------------------------------------------------------------- Clock SETC ; Set Carry bit. DADC.b SEC ; Increment seconds decimally CMP.b #060h,SEC ; One minute elapsed? JLO Clockend ; No, return CLR.b SEC ; Yes, clear seconds DADC.b MIN ; Increment minutes decimally CMP.b #060h,MIN ; Sixty minutes elapsed? JLO Clockend ; No, return CLR.b MIN ; yes, clear minutes DADC.b HR ; Increment Hours decimally CMP.b #024h,HR ; 24 hours elapsed? JLO Clockend ; No, return CLR.b HR ; yes, clear hours Clockend MOV.b SEC,&P1OUT MOV.b MIN,&P2OUT RET ; ;----------------------------------------------------------------------------- ; Setup: Configure Modules and Control Registers ;----------------------------------------------------------------------------- Setup BIS.b #BIT0,&IE1 ; Enable Watchdog Int. MOV #WDTPW+WDTTMSEL+WDTCNTCL+WDTSSEL,&WDTCTL ; Stop Watchdog Timer ; Set in interval ; timer mode and set ; interrupt interval ; 1s with ACLK. MOV.b #0FFh,&P1DIR MOV.b #0FFh,&P2DIR MOV.b #00,&P1OUT MOV.b #00,&P2OUT ClearRTC MOV.b #00h,SEC ; Clear SEC MOV.b #00h,MIN ; Clear MIN MOV.b #00h,HR ; Clear HR EINT ; Enable interrupts RET ; Done with setup. ;----------------------------------------------------------------------------- ; Watchdog ISR: ; CPU is simply returned to active state on RETI by manipulated the SR ; bits in the SR value that was pushed onto the stack. ; Interrupt flag is reset automatically ;----------------------------------------------------------------------------- WDINT BIC #LPM3,0(SP) ; Clear SR LPM3 Bits, on top of stack RETI ; ;----------------------------------------------------------------------------- RSEG INTVEC ; Interrupt vectors ;----------------------------------------------------------------------------- DW RESET ; DW RESET ; DW RESET ; DW RESET ; DW RESET ; DW RESET ; DW RESET ; DW RESET ; DW RESET ; DW RESET ; Timer_A (CCIFG0) DW WDINT ; Watchdog Timer DW RESET ; DW RESET ; DW RESET ; DW RESET ; NMI, Osc. fault DW RESET ; POR, ext. Reset, Watchdog END