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EM73983

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

EM73983

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

The display data from the display data area are automatically read out and send to the LCD driver directly by

the hardware . Therefore, the display patterns can be changed only by overwritting the contents of the

display data area through software .

The dispaly memory area that is not used to store the LCD display data could be used as the ordinary data

memory.

LCD display data area :

Bank1

P9.3=1

0

1

2

3

45

6

7

8

9

A

B

C

D

E

F

100-10Fh

110-11Fh

120-12Fh

130-13Fh

140-14Fh

150-15Fh

160-16Fh

170-17Fh

180-18Fh

190-19Fh

1A0-1AFh

1B0-1BFh

1C0-1CFh

1D0-1DFh

1E0-1EFh

1F0-1FFh

COM0

COM1

COM2

COM3

COM4

COM5

COM6

COM7

P26 is the start address register of LCD common pin.

Port26 3 2 1 0 Initial value: 0000

CSA

CSA

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

100-

109h

COM0

COM7

COM6

COM5

COM4

COM3

COM2

COM1

110-

119h

COM1

COM0

COM7

COM6

COM5

COM4

COM3

COM2

120-

129h

COM2

COM1

COM0

COM7

COM6

COM5

COM4

COM3

130-

139h

COM3

COM2

COM1

COM0

COM7

COM6

COM5

COM4

Common start address register

RAM

140- 150- 160- 170- 180- 190-

149h 159h 169h 179h 189h 199h

COM4 COM5 COM6 COM7

COM3 COM4 COM5 COM6 COM7

COM2 COM3 COM4 COM5 COM6 COM7

COM1 COM2 COM3 COM4 COM5 COM6

COM0 COM1 COM2 COM3 COM4 COM5

COM0 COM1 COM2 COM3 COM4

COM0 COM1 COM2 COM3

COM0 COM1 COM2

COM0 COM1

COM0

1A0-

1A9h

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

1B0-

1B9h

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

COM7

COM6 COM7

COM5 COM6

COM7

1C0-

1C9h

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

1D0- 1E0- 1F0-

1D9h 1EF9h 1F9h

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

COM7

COM6

COM5

COM4

COM3

COM2

COM1

COM0

PROGRAM EXAMPLE:

LDIA #0000B

OUTA P26

LDIA #1100B ; LCD display enable

OUTA P27

LDIA #1010B ; store 1010B to RAM[101h]

SEP P9,3

STA 01H

* This specification are subject to be changed without notice.

10.31.2000 21

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