1996 Nov 29

21

Philips Semiconductors

Product specification

8-bit microcontrollers with OSD and VST

84C44X; 84C64X; 84C84X

12.5

Display data registers

The display data registers consists of a group of 32 derivative registers located at addresses 20H to 3FH inclusive

(see Table 7). At power-up the contents of the display data registers are undefined.

The format of each display data register is shown in Table 8, and their functions described in Table 9.

Table 7

Display data registers addresses

Table 8

Display data register (address 20H to 3FH)

Table 9

Description of display data register bits

12.6

Display control registers

The display control registers consists of a group of 6 derivative registers located at addresses 40H to 45H inclusive

(see Table 10). Each register may be read from or written to. After a reset operation the contents of the display control

registers are zero.

Table 10 Display control registers addresses

ADDRESS

DISPLAY DATA FOR

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

20H to 2FH

Row 0 = the first display row

CC1

CC0

MD5

MD4

MD3

MD2

MD1

MD0

30H to 3FH

Row 1 = the second display row

76543210

CC1

CC0

MD5

MD4

MD3

MD2

MD1

MD0

BIT

SYMBOL

DESCRIPTION

7

CC1

Colour code. The state of these two bits enable individual characters to be displayed in

one of four colours. See Tables 24, 25 and 26.

6

CC0

5

MD5

Character code.

The character set is stored in ROM and consists of 64 different characters.

The selection of each character is dependent on the state of the 6 bits, MD0 to MD5.

4

MD4

3

MD3

2

MD2

1

MD1

0

MD0

ADDRESS

REGISTER

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

40H

OSDCA

CC34

CC24

CC14

RBLK

ROUND

STBY

VLVL

HLVL

41H

LINE 0A

SZ01

SZ00

VP05

VP04

VP03

VP02

VP01

VP00

42H

LINE 0B

BLK0

VB0

HP05

HP04

HP03

HP02

HP01

HP00

43H

OSDCB

CDTW

CDTH

CC33

CC23

CC32

CC12

CC21

CC11

44H

LINE 1A

SZ11

SZ10

VP15

VP14

VP13

VP12

VP11

VP10

45H

LINE 1B

BLK1

VB1

HP15

HP14

HP13

HP12

HP11

HP10