Freescale Semiconductor DRM079 manual MAPADDR6SRS, Rts Drive coil

			Temperature Sensor Measurement
;5) Read Temp Sensor Again			; Read Sensor value
bsr	ReadSensor
;6) Dead time control
StartTimer
;7) During the dead time, update dead time period every 128ms
brclr	SRTISC_RTIF, MAP_ADDR_6(SRTISC), UpdateLater; Update PWM duty cycle
jsr	TableLookup
UpdateLater:	ActualPeriod
lda		; Actual-Target
sub	TargetPeriod
blo	IncPeriod	; if same, Fan speed reach target then exit
beq	WaitAgain
DecPeriod:	DeadTime	; if bigger, decrement DeadTime
lda
cmp	#MinDeadTime
blo	WaitAgain
dec	DeadTime
bra	WaitAgain
IncPeriod:	DeadTime	; if smaller, increment DeadTime
lda
cmp	#MaxDeadTime
bhs	WaitAgain
inc	DeadTime
bra	WaitAgain
WaitAgain:
;8) Bump COP	MAP_ADDR_6(SRS)		; Bump COP
sta
wait	#(mMTIMSC_TSTPmMTIMSC_TRST), MTIMSC; mask interrupt and clear flag
mov

;9) Repeat the control cycle

bra FanControlLoop

;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

;Delay 16ms ;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Delay:

mov	#255, MTIMMOD	; OF period
mov	#(mMTIMSC_TRSTmMTIMSC_TOIE), MTIMSC; Reset and Start Timer
wait	#(mMTIMSC_TSTPmMTIMSC_TRST), MTIMSC; mask interrupt and clear flag
mov
sta	MAP_ADDR_6(SRS)	; Bump COP
rts

;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

;Drive coil

Variable Speed DC Fan Control using the MC9RS08KA2, Rev. 0

Freescale Semiconductor 29