fet430_oa_10.s43

来自「MSP430FG43x系列单片机汇编源代码」· S43 代码 · 共 49 行

;******************************************************************************
;   MSP-FET430P430 Demo - OA1, Non-Inverting PGA Mode
;
;   Description: Configure OA1 for Non-Inverting PGA mode. In this mode,
;   the "-" terminal is connected to the R ladder tap and the OAFBRx bits
;   select the gain.
;   ACLK = n/a, MCLK = SMCLK = default DCO
;
;                 MSP430FG439
;              -------------------
;          /|\|                XIN|-
;           | |                   |
;           --|RST            XOUT|-
;             |                   |
;      "+" -->|P6.4/OA1I0         |
;             |                   |
;             |          P6.3/OA1O|--> OA1 Output
;             |                   |    Gain is 8
;
;   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,&OA1CTL0 ; Slow slew rate,
                                            ; "+" connected to OA1IO (default),
                                            ; output connected to A3
            mov.b   #OAFC_4+OAFBR_6+OARRIP,&OA1CTL1
                                            ; Non-inverting PGA mode,
                                            ; gain is 8,
                                            ; 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