fet430_oa_01.s43

来自「MSP430FG43x系列单片机汇编源代码」· S43 代码 · 共 50 行

;******************************************************************************
;   MSP-FET430P430 Demo - OA0, Comparator Mode
;
;   Description: Configure OA0 for Comparator mode. In this example, OA0 is
;   configured as a comparator. The comparator reference is connected to
;   the "-" input and comes from the integrated R ladder. The reference level
;   is selected with the OAFBR bits. The "+" terminal is connected to OA0I0.
;   ACLK = n/a, MCLK = SMCLK = default DCO
;
;                 MSP430FG439
;              -------------------
;          /|\|                XIN|-
;           | |                   |
;           --|RST            XOUT|-
;             |                   |
;      "+" -->|P6.0/OA0I0         |
;             |                   |
;             |          P6.1/OA0O|--> OA0 Output
;             |                   |    Output goes high when
;             |                   |    Input > (0.25 * AVcc)
;
;   M. Mitchell
;   Texas Instruments Inc.
;   Feb 2005
;   Built with IAR Embedded Workbench Version: 3.21A
;******************************************************************************
#include  <msp430xG43x.h>

;------------------------------------------------------------------------------
            ORG     01100h                  ; Program Start
;------------------------------------------------------------------------------
RESET       mov.w   #0A00h,SP               ; Initialize stack pointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
                                            ;
SetupOA     mov.b   #OAPM_1+OAADC1,&OA0CTL0 ; Slow slew rate,
                                            ; "+" connected to OA0IO (default),
                                            ; output connected to A1
            mov.b   #OAFC_3+OAFBR_1+OARRIP,&OA0CTL1
                                            ; Comparator mode,
                                            ; "-" connected to AVcc * 4/16,
                                            ; limited range (see datasheet)						
Mainloop    bis.w   #LPM3,SR                ; Enter LPM3
            nop                             ; Required only for debug
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            ORG     0FFFEh                  ; RESET Vector
            DW      RESET                   ;
            END