SLAS191A datasheet(33/86 Pages) TI

33 / 86 page

1–27

;****************************************************************************

; Section in EPROM

;****************************************************************************

.sect “PrepLCD”, EPROM_orig

;––– Prepare LCD and Basic timer

PrepLCD

MOV.B

#–1h,LCDM

;LCD : Analog generator on Low

;

impedance 4 Mux active

;

all outputs are Seg

MOV.B

#057h,BTCTL

; Basic Timer : SSEL=0 DIV=0 Reset=1

; ACLK

; 32768/256 = 128 Hz

; (7.8 ms debounce time)

; LCD frame frequency @ 4 Mux: 64 Hz

BIS.B

#BTME,ME2

; Enable basic timer module

BIC.B

#040h,BTCTL

; Basic Timer reset disabled

BIS.B

#BTIE,IE2

; enable basic timer interrupt

MOV.B

#lcd_ival,lcd_timer ; load SW lcd timer

CALL

#show_cir

; clear LCD

EINT

; enable interrupts

;––– clear LCD

.sect “show_clr:”,EPROM_orig+50h

show_clr

MOV

#15, r5

; clear display memory

show_clrl

MOV.b

#0, LCD1–1(r5)

DEC

JNz

show_clr1

RET

;****************************************************************************

; Basic Timer Interrupt routine

;****************************************************************************

.sect

“Int_BT” ,EPROM_orig+100h

Int_BT

; Basic Timer 128 Hz (7.8 ms)

DEC.B

lcd_timer

; decrement SW lcd-timer

JNZ

Int_BT_end

; !0 : no action

BIC

#CPUOFF,0 (SP)

; Clear CPUoff Bit

MOV.B

#lcd_ival,lcd_timer ; =0 : load again

Int_BT_end

RETI

Figure 1–23. EPROM LCD and Interrupt Routine

Now these routines can be used in any other program. This section does not have to be downloaded again,

even if the STK/EVK is disconnected from the power supply.

To load a program using the HyperTerminal, double click the terminal icon in the MSP-STK/EVK430 program

group in the Windows Program Manager. The HyperTerminal window appears as follows in Figure 1–24.

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