PCF8578 Philips Semiconductors, PCF8578 Datasheet - Page 21

• Manufacturer Part Number: PCF8578
• Description: LCD row/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.14). 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 PCF8578 are defined
in Tables 5 and 6.
Table 5 Summary of commands
Note
1. C = command continuation bit. D = may be a logic 1 or 0.
1998 Sep 08
SET MODE
SET START BANK
DEVICE SELECT
RAM ACCESS
LOAD X-ADDRESS
LCD row/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
D
0
1
1
1
OPCODE
D
D
1
0
1
D
D
D
D
1
(1)
D
D
D
D
1
21
D
D
D
D
D
D
D
D
D
D
C = 0; last command.
C = 1; commands continue.
Fig.14 General information of command byte.
multiplex rate, display status, system type
defines bank at top of LCD
defines device subaddress
graphic mode, bank select (D D D D
allowed; see SET START BANK opcode)
0 to 39
MSB
C
REST OF OPCODE
DESCRIPTION
Product specification
MSA833
PCF8578
LSB
12 is not