diffamp.asm

Application Note Abstract The unique configuration of the PSoC&reg switched capacitor blocks allows

;;********************************************************************
;;********************************************************************
;;  DiffAmp.asm
;;
;;  Assembler source for Generic Switched Cap (SCBLOCK) User Module
;;
;;  REV B, 2002 Aug 22
;;
;;  Copyright: Cypress MicroSystems 2000-2002.  All Rights Reserved.
;;
;;*********************************************************************
;;*********************************************************************

export  DiffAmp_Start
export _DiffAmp_Start
export  DiffAmp_SetPower
export _DiffAmp_SetPower
export  DiffAmp_Stop
export _DiffAmp_Stop

;; -----------------------------------------------------------------
;;                         Register Definitions
;; -----------------------------------------------------------------
;; BIT FIELD            Mask 
;; -----------------    ----- 
;; CR0.FCap              80
;; CR0.ClockPhase        40
;; CR0.ASign             20
;; CR0.ACap              1F
;; 
;; CR1.AMux              C0   SCB
;; CR1.ACMux             C0   SCA
;; CR1.BCap              1F
;;
;; CR2.AnalogBus         80
;; CR2.CmpBus            40
;; CR2.AutoZero          20
;; CR2.CCap              1F
;;
;; CR3.RefSelect         C0
;; CR3.FSW1              20
;; CR3.FSW0              10
;; CR3.BSW               08   SCB
;; CR3.BMux              04   SCB
;; CR3.BMux              0C   SCA
;; CR3.Power             03
;;

include "DiffAmp.inc"
include "m8c.inc"

;;-------------------------------------------------------------------
;;  Start:
;;  SetPower:
;;  Applies power setting to the module's analog PSoc block.
;;  INPUTS:  A contains the power setting 0-3
;;  OUTPUTS: None.  
;;------------------------------------------------------------------
 DiffAmp_Start:
_DiffAmp_Start:
 DiffAmp_SetPower:
_DiffAmp_SetPower:
   and  A,03h
   push X
   mov  X,SP

   push A
   mov  A,reg[DiffAmp_cr3]
   and  A,~03h
   or   A,[X]
   mov  reg[DiffAmp_cr3],A
   pop  A
   pop  X
   ret


;;------------------------------------------------------------------
;;  Stop:
;;  Removes power from the module's analog PSoc block.
;;
;;  INPUTS:  None.
;;  OUTPUTS: None.  
;;
;;------------------------------------------------------------------

 DiffAmp_Stop:
_DiffAmp_Stop:
   and  reg[DiffAmp_cr3],~03h
   ret

DiffAmp_API_End: