AN594 datasheet(24/28 Pages) STMICROELECTRONICS

24 / 28 page

Direct LCD Drive

24/28

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

HEXADECIMAL — > DECIMAL DATA CONVERSION SUBROUTINE

;* task : convert an hexadecimal data in a Binary Coded Decimal data

determine data/rom window address of segments driver byte

hexadecimal data is a stable data varying from 0 to 256

result is a percent decimal data varying from 0 to 99

BCD

Binary Coded Decimal data

for instance, data is duty0

DIG1 = data/rom WDW @ of DIGIT1 segments driver = 01wxyzAB

DIGIT1 = wxyz ( from 0 to 9 ) and

AB are defined by phase operation : AB = 00 for phase1 ...

AB = 11 for phase4

DIG2 = data/rom WDXW @ of DIGIT2 segments driver

similar writing than DIG1

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

DECCONV

jrr

7,duty0,ET1

; DATA <== duty0

ldi

drwr,039h

; b7 of DATA is 1 : 50 < DATA < 99

ET2

ET1

ldi

drwr,038h

; b7 of DATA is 0 : 00 < DATA < 49

ET2

a,duty0

;

rlc

;

rlc

;

rlc

; calculation of BinCodDec DATA

rlc

; address

rlc

;

rlc

;

rlc

;

rlc

;

set

6,a

;

res

7,a

;

x,a

;

a,(x)

;

BCD,a

; BCD <= Binary Coded Decimal DATA

andi

a,00fh

; determine DIGIT1 value and the

sla

; data/rom address of DIGIT1 segments

sla

; driver

addi

a,040h

;

DIG1,a

; DIG1 = data/rom @ of segment driver

a,BCD

; determine DIGIT2 value and the

andi

a,0f0h

; data/rom address of DIGIT2 segments

rlc

;

driver

rlc

;

rlc

;

rlc

;

rlc

;

sla

;

sla

;

ANNEX 2: Software of the ST6265x based application (Continued)

AN594 bảng dữ liệu(PDF) 24 Page - STMicroelectronics

AN594 bảng dữ liệu(HTML) 24 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

bảng dữ liệu tải về

Link URL