AN594 datasheet(15/28 Pages) STMICROELECTRONICS

15 / 28 page

Direct LCD Drive

15/28

TSTLIGN

RES

0,ORA

;

RES

1,ORA

;

RES

2,ORA

; A0, A1 & A2 become open drain output

RES

0,DDRA

;

RES

1,DDRA

;

RES

2,DDRA

; then pull up input

SET

3,DDRA;

SET

4,DDRA;

SET

5,DDRA

; A3, A4 & A5 become open drain output

SET

3,ORA

;

SET

4,ORA

;

SET

5,ORA

; then push pull output at Vss

A,DRA

ANDI A,07h

JRR

0,A,LIGN2

; if A0 = 0 then row #2

JRR

1,A,LIGN3

; if A1 = 0 then row #3

JRR

2,A,LIGN4

; if A2 = 0 then row #4

LIGN1

CLAVIER3

; else row #1 is selected & TOUCH unchanged

LIGN2

A,TOUCH

ADDI A,3

TOUCH,A

; row #2 so TOUCH

∂ TOUCH + 3

CLAVIER3

LIGN3

A,TOUCH

ADDI A,6

TOUCH,A

; row #3 so TOUCH

∂ TOUCH + 6

CLAVIER3

LIGN4

JRS

0,TOUCH,ONOFF1

LDI

TOUCH,00h

CLAVIER3

ONOFF1

LDI

TOUCH,0Ah

; TOUCH

∂ 0Ah means action on ON/OFF button

CLAVIER3 RES

3,ORA

;

RES

4,ORA

;

RES

5,ORA

; A3, A4 & A5 become open drain ouput

RES

3,DDRA

;

RES

4,DDRA

;

RES

5,DDRA

; then pull up inputs

SET

0,DDRA

;

SET

1,DDRA

;

SET

2,DDRA

; A0, A1 & A2 become open drain output

SET

0,ORA;

SET

1,ORA;

SET

2,ORA

; then push pull output at Vss

CLAVIER4 LD

A,TOUCH

A,TOUCHP

JRNZ CLAVIER5

FINCLAV

; IF unchanged state keyboard THEN end

CLAVIER5 LD

TOUCHP,A

; ELSE TOUCHP

∂ TOUCH

CPI

A,0FFh

JRNZ CLAVIER7

; IF any keyboard buttons are pushed

FINCLAV

; THEN end of subroutine

CLAVIER7 CPI

A,0Ah

; ELSE test ON/OFF button

JRZ

ONOFF2

; IF yes THEN set FLAGS

A,TOUCHU

; ELSE shift keyboard value

TOUCHD,A;

A,TOUCH;

TOUCHU,A

; to be displayed

FINCLAV

ONOFF2

SET

0,FLAGS

FINCLAV

RET

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

END OF KEYBOARD SUBROUTINE

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

ANNEX 1: Software of the ST6215x based application (Continued)

AN594 Datasheet(PDF) 15 Page - STMicroelectronics

AN594 Datasheet(HTML) 15 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

Datasheet Download

Link URL