AY0438-I/L Microchip Technology Inc., AY0438-I/L Datasheet - Page 5

• Manufacturer Part Number: AY0438-I/L
• Description: 44 PIN, LCD DRIVER
• Manufacturer: Microchip Technology Inc.

Specifications of AY0438-I/L

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

;The DP are not connected, but can be connected to seg8, 16, 24 & 32.
;For each digit, the segments are connected as:
;
;
;
;
;
;
;
;where n = 0, 1, 2 and 3 for MSD, 3rdSD, 2ndSD and LSD respectively.
;The firmware uses the values in registers:
;
;pulsed to the AY0438.
;In this example, a pushbutton connected to PORTB bit 7
;is checked periodically to see if it has been pressed. If so,
;the LCD values in locations MSD to LSD are updated.
;*************************************************************************
;
;
MSD
THRDSD
SCNDSD
LSD
count
temp
PORTB
#define CLK
#define DATAIN
#define LOAD
#define UPDATELCD PORTB,7
w
STATUS
C
RP0
OPTION
RBPU
PCL
PCLATH
;
;
;
;This DecodeValue table must reside in page 0 for this program to work
;
DecodeValue
1995 Microchip Technology Inc.
Seg A --> seg(8*n + 1)
Seg B --> seg(8*n + 2)
Seg C --> seg(8*n + 3)
Seg D --> seg(8*n + 4)
Seg E --> seg(8*n + 5)
Seg F --> seg(8*n + 6)
Seg G --> seg(8*n + 7)
MSD, THRDSD, SCNDSD and LSD
list p=16c71,f=inhx8m
equ
equ
equ
equ
equ
equ
equ
equ
equ
equ
equ
equ
equ
equ
equ
org
goto
org
addwf
retlw
retlw
retlw
retlw
retlw
retlw
0x20
0x21
0x22
0x23
0x24
0x25
0x06
PORTB,0
PORTB,1
PORTB,2
0
0x03
0
5
0x81
7
0x02
0x0A
0
start
0x10
PCL
B'00111111'
B'00000110'
B'01011011'
B'01001111'
B'01100110'
B'01101101'
;decode for 0
;decode for 1
;decode for 2
;decode for 3
;decode for 4
;decode for 5
to determine the values to be
AY0438
DS70010I-page 5