PCF8579 Philips Semiconductors, PCF8579 Datasheet - Page 18

• Manufacturer Part Number: PCF8579
• Description: LCD column driver for dot matrix graphic displays
• Manufacturer: Philips Semiconductors

Philips Semiconductors
8.1
The command decoder identifies command bytes that
arrive on the I
command is the continuation bit C (see Fig.12). When this
bit is set, it indicates that the next byte to be transferred will
also be a command. If the bit is reset, it indicates the
conclusion of the command transfer. Further bytes will be
regarded as display data. Commands are transferred in
WRITE mode only.
The five commands available to the PCF8579 are defined
in Tables 2 and 3.
Table 2 Summary of commands
Note
1. C = command continuation bit. D = may be a logic 1 or 0.
1997 Apr 01
SET MODE
SET START BANK
DEVICE SELECT
RAM ACCESS
LOAD X-ADDRESS
LCD column driver for dot matrix graphic
displays
COMMAND
Command decoder
2
C-bus. The most significant bit of a
C
C
C
C
C
1
1
1
1
0
0
1
1
1
D
OPCODE
D
1
0
1
D
D
1
D
D
D
(1)
D
1
D
D
D
D
D
D
D
D
D
D
D
D
D
18
multiplex rate, display status, system type
defines bank at top of LCD
defines device subaddress
graphic mode, bank select (D D D D
see SET START BANK opcode)
0 to 39
C = 0; last command.
C = 1; commands continue.
Fig.12 General format of command byte.
MSB
C
DESCRIPTION
REST OF OPCODE
Product specification
12 is not allowed;
MSA833
PCF8579
LSB