Matrix LED Display Driver

18

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REGISTER DATA

SCAN

LIMIT

ADDRESS CODE

(HEX)

D7

D6

D5

D4

D3

D2

D1

D0

HEX

CODE

Display Digits 0 and 1 Only

0x03

X

X

X

X

X

X

X0

0xX0

Display Digits 0, 1, 2, and 3

0x03

X

X

X

X

X

X

X1

0xX1

Table 21. Scan-Limit Register Format

REGISTER DATA

FONT

CHARACTER

FONT

ADDRESS

POINTER

ADDRESS

CODE (HEX)

FONT

POINTER

ADDRESS

(HEX)

D7

D6

D5

D4

D3

D2

D1

D0

RAM00

0x00

0x05

0x80

0

0

1

1

1

1

1

0

RAM00

0x01

0x05

0x81

0

1

0

1

00

0

1

RAM00

0x02

0x05

0x82

0

1

00

1

00

1

RAM00

0x03

0x05

0x83

0

1

00

0

1

0

1

RAM00

0x04

0x05

0x84

0

0

1

1

1

1

1

0

RAM01

0x05

0x05

0x85

0

0

0

0

0

0

0

0

RAM01

0x06

0x05

0x86

0

1

0

000

1

0

RAM01

0x07

0x05

0x87

0

1

1

1

1

1

1

1

RAM01

0x08

0x05

0x88

0

1

0

000

00

RAM01

0x09

0x05

0x89

0

0

0

0

0

0

0

0

RAM02

0x0A

0x05

0x8A

0

1

0

000

1

0

RAM02

0x0B

0x05

0x8B

0

1

1

000

0

1

RAM02

0x0C

0x05

0x8C

0

1

0

1

00

0

1

RAM02

0x0D

0x05

0x8D

0

1

00

1

00

1

RAM02

0x0E

0x05

0x8E

0

1

00

0

1

1

0

Table 19. User-Definable Character Storage Example

ADDRESS CODE

(HEX)

REGISTER DATA

(HEX)

ACTION BEING PERFORMED

0x05

0x8A

Set font address pointer to the base address of font character RAM02.

0x05

0x42

1st 7 bits of data: 1000010 goes to font address 0x8A; pointer then autoincrements

to address 0x8B.

0x05

0x61

2nd 7 bits of data: 1100001 goes to font address 0x8B; pointer then

autoincrements to address 0x8C.

0x05

0x51

3rd 7 bits of data: 1010001 goes to font address 0x8C; pointer then

autoincrements to address 0x8D.

0x05

0x49

4th 7 bits of data: 1001001 goes to font address 0x8D; pointer then

autoincrements to address 0x8E.

0x05

0x46

5th 7 bits of data: 1000110 goes to font address 0x8E; pointer then autoincrements

to address 0x8F.

Table 20. Setting a Font Character to RAM Example